23172957 has 12 divisors (see below), whose sum is σ = 33528924. Its totient is φ = 15422400.

The previous prime is 23172949. The next prime is 23172973. The reversal of 23172957 is 75927132.

It can be written as a sum of positive squares in 2 ways, for example, as 10169721 + 13003236 = 3189^2 + 3606^2 .

It is not a de Polignac number, because 23172957 - 2³ = 23172949 is a prime.

It is a super-2 number, since 2×23172957² = 1073971872247698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4473 + ... + 8145.

It is an arithmetic number, because the mean of its divisors is an integer number (2794077).

Almost surely, 2^23172957 is an apocalyptic number.

It is an amenable number.

23172957 is a deficient number, since it is larger than the sum of its proper divisors (10355967).

23172957 is a wasteful number, since it uses less digits than its factorization.

23172957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380 (or 4377 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 23172957 is about 4813.8297643353. The cubic root of 23172957 is about 285.0977688574.

The spelling of 23172957 in words is "twenty-three million, one hundred seventy-two thousand, nine hundred fifty-seven".