172157404 has 24 divisors (see below), whose sum is σ = 318034640. Its totient is φ = 81316224.

The previous prime is 172157399. The next prime is 172157407. The reversal of 172157404 is 404751271.

172157404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172157407) 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, 25312 + ... + 31384.

Almost surely, 2^172157404 is an apocalyptic number.

It is an amenable number.

172157404 is a deficient number, since it is larger than the sum of its proper divisors (145877236).

172157404 is a wasteful number, since it uses less digits than its factorization.

172157404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6469 (or 6467 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 172157404 is about 13120.8766475415. The cubic root of 172157404 is about 556.2993703770.

The spelling of 172157404 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, four hundred four".