638494254 has 24 divisors (see below), whose sum is σ = 1393507440. Its totient is φ = 211277088.

The previous prime is 638494249. The next prime is 638494291. The reversal of 638494254 is 452494836.

638494254 is a `hidden beast` number, since 638 + 4 + 9 + 4 + 2 + 5 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126994 + ... + 131925.

It is an arithmetic number, because the mean of its divisors is an integer number (58062810).

Almost surely, 2^638494254 is an apocalyptic number.

638494254 is an abundant number, since it is smaller than the sum of its proper divisors (755013186).

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

638494254 is a wasteful number, since it uses less digits than its factorization.

638494254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259064 (or 259061 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 638494254 is about 25268.4438381156. The cubic root of 638494254 is about 861.0975054179.

The spelling of 638494254 in words is "six hundred thirty-eight million, four hundred ninety-four thousand, two hundred fifty-four".