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19138230 = 2325337631
BaseRepresentation
bin100100100000…
…0011010110110
31100000022201100
41021000122312
514344410410
61522110530
7321446406
oct111003266
940008640
1019138230
11a891921
1264ab446
133c710c7
142782806
151a308c0
hex12406b6

19138230 has 48 divisors (see below), whose sum is σ = 49986144. Its totient is φ = 5080320.

The previous prime is 19138219. The next prime is 19138237. The reversal of 19138230 is 3283191.

It is a junction number, because it is equal to n+sod(n) for n = 19138194 and 19138203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30015 + ... + 30645.

It is an arithmetic number, because the mean of its divisors is an integer number (1041378).

Almost surely, 219138230 is an apocalyptic number.

19138230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19138230 is an abundant number, since it is smaller than the sum of its proper divisors (30847914).

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

19138230 is a wasteful number, since it uses less digits than its factorization.

19138230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 19138230 is about 4374.7262771515. The cubic root of 19138230 is about 267.4857126908.

The spelling of 19138230 in words is "nineteen million, one hundred thirty-eight thousand, two hundred thirty".

Divisors: 1 2 3 5 6 9 10 15 18 30 45 90 337 631 674 1011 1262 1685 1893 2022 3033 3155 3370 3786 5055 5679 6066 6310 9465 10110 11358 15165 18930 28395 30330 56790 212647 425294 637941 1063235 1275882 1913823 2126470 3189705 3827646 6379410 9569115 19138230