638926532 has 12 divisors (see below), whose sum is σ = 1128571920. Its totient is φ = 316477416.

The previous prime is 638926531. The next prime is 638926543. The reversal of 638926532 is 235629836.

It is a super-2 number, since 2×638926532² = 816454226587094048, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (638926531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745982 + ... + 746837.

It is an arithmetic number, because the mean of its divisors is an integer number (94047660).

Almost surely, 2^638926532 is an apocalyptic number.

It is an amenable number.

638926532 is a deficient number, since it is larger than the sum of its proper divisors (489645388).

638926532 is a wasteful number, since it uses less digits than its factorization.

638926532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492930 (or 1492928 counting only the distinct ones).

The product of its digits is 466560, while the sum is 44.

The square root of 638926532 is about 25276.9961031765. The cubic root of 638926532 is about 861.2917904004.

The spelling of 638926532 in words is "six hundred thirty-eight million, nine hundred twenty-six thousand, five hundred thirty-two".