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19400478990 = 2353743894567
BaseRepresentation
bin10010000100010110…
…111101000100001110
31212002001102110000220
4102010112331010032
5304213010311430
612525031332210
71254522231144
oct220426750416
955061373026
1019400478990
118256079012
123915221066
131aa2419089
14d20825594
157882e5110
hex4845bd10e

19400478990 has 128 divisors (see below), whose sum is σ = 49492270080. Its totient is φ = 4860269568.

The previous prime is 19400478973. The next prime is 19400478997. The reversal of 19400478990 is 9987400491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400478997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4245687 + ... + 4250253.

It is an arithmetic number, because the mean of its divisors is an integer number (386658360).

Almost surely, 219400478990 is an apocalyptic number.

19400478990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19400478990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24746135040).

19400478990 is an abundant number, since it is smaller than the sum of its proper divisors (30091791090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19400478990 is a wasteful number, since it uses less digits than its factorization.

19400478990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 19400478990 in words is "nineteen billion, four hundred million, four hundred seventy-eight thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 37 43 74 86 89 111 129 178 185 215 222 258 267 370 430 445 534 555 645 890 1110 1290 1335 1591 2670 3182 3293 3827 4567 4773 6586 7654 7955 9134 9546 9879 11481 13701 15910 16465 19135 19758 22835 22962 23865 27402 32930 38270 45670 47730 49395 57405 68505 98790 114810 137010 141599 168979 196381 283198 337958 392762 406463 424797 506937 589143 707995 812926 844895 849594 981905 1013874 1178286 1219389 1415990 1689790 1963810 2032315 2123985 2438778 2534685 2945715 4064630 4247970 5069370 5891430 6096945 7266097 12193890 14532194 15039131 17477909 21798291 30078262 34955818 36330485 43596582 45117393 52433727 72660970 75195655 87389545 90234786 104867454 108991455 150391310 174779090 217982910 225586965 262168635 451173930 524337270 646682633 1293365266 1940047899 3233413165 3880095798 6466826330 9700239495 19400478990