9157972 has 12 divisors (see below), whose sum is σ = 16169076. Its totient is φ = 4538240.

The previous prime is 9157969. The next prime is 9158003. The reversal of 9157972 is 2797519.

It can be written as a sum of positive squares in 2 ways, for example, as 133956 + 9024016 = 366^2 + 3004^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9679 + ... + 10582.

It is an arithmetic number, because the mean of its divisors is an integer number (1347423).

Almost surely, 2^9157972 is an apocalyptic number.

It is an amenable number.

9157972 is a deficient number, since it is larger than the sum of its proper divisors (7011104).

9157972 is a wasteful number, since it uses less digits than its factorization.

9157972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20378 (or 20376 counting only the distinct ones).

The product of its digits is 39690, while the sum is 40.

The square root of 9157972 is about 3026.2141365079. The cubic root of 9157972 is about 209.2183489128.

The spelling of 9157972 in words is "nine million, one hundred fifty-seven thousand, nine hundred seventy-two".