Base | Representation |
---|---|
bin | 10010000100010110… |
… | …111101000100001110 |
3 | 1212002001102110000220 |
4 | 102010112331010032 |
5 | 304213010311430 |
6 | 12525031332210 |
7 | 1254522231144 |
oct | 220426750416 |
9 | 55061373026 |
10 | 19400478990 |
11 | 8256079012 |
12 | 3915221066 |
13 | 1aa2419089 |
14 | d20825594 |
15 | 7882e5110 |
hex | 4845bd10e |
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".
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