638125494 has 8 divisors (see below), whose sum is σ = 1276251000. Its totient is φ = 212708496.

The previous prime is 638125471. The next prime is 638125519. The reversal of 638125494 is 494521836.

It is a sphenic number, since it is the product of 3 distinct primes.

638125494 is an admirable number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53177119 + ... + 53177130.

It is an arithmetic number, because the mean of its divisors is an integer number (159531375).

Almost surely, 2^638125494 is an apocalyptic number.

638125494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638125494 is a wasteful number, since it uses less digits than its factorization.

638125494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106354254.

The product of its digits is 207360, while the sum is 42.

The square root of 638125494 is about 25261.1459360022. The cubic root of 638125494 is about 860.9316989314.

The spelling of 638125494 in words is "six hundred thirty-eight million, one hundred twenty-five thousand, four hundred ninety-four".