638857473 has 16 divisors (see below), whose sum is σ = 859842816. Its totient is φ = 421906320.

The previous prime is 638857459. The next prime is 638857519. The reversal of 638857473 is 374758836.

It is not a de Polignac number, because 638857473 - 2⁶ = 638857409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638857403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159886 + ... + 163832.

It is an arithmetic number, because the mean of its divisors is an integer number (53740176).

Almost surely, 2^638857473 is an apocalyptic number.

It is an amenable number.

638857473 is a deficient number, since it is larger than the sum of its proper divisors (220985343).

638857473 is a wasteful number, since it uses less digits than its factorization.

638857473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444.

The product of its digits is 3386880, while the sum is 51.

The square root of 638857473 is about 25275.6300218214. The cubic root of 638857473 is about 861.2607580934.

The spelling of 638857473 in words is "six hundred thirty-eight million, eight hundred fifty-seven thousand, four hundred seventy-three".