638924234 has 16 divisors (see below), whose sum is σ = 1035928320. Its totient is φ = 293796720.

The previous prime is 638924233. The next prime is 638924239. The reversal of 638924234 is 432429836.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 638924191 and 638924200.

It is not an unprimeable number, because it can be changed into a prime (638924233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38294 + ... + 52385.

It is an arithmetic number, because the mean of its divisors is an integer number (64745520).

Almost surely, 2^638924234 is an apocalyptic number.

638924234 is a deficient number, since it is larger than the sum of its proper divisors (397004086).

638924234 is a wasteful number, since it uses less digits than its factorization.

638924234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90965.

The product of its digits is 248832, while the sum is 41.

The square root of 638924234 is about 25276.9506467849. The cubic root of 638924234 is about 861.2907578086.

The spelling of 638924234 in words is "six hundred thirty-eight million, nine hundred twenty-four thousand, two hundred thirty-four".