13091872 has 12 divisors (see below), whose sum is σ = 25774686. Its totient is φ = 6545920.

The previous prime is 13091849. The next prime is 13091873. The reversal of 13091872 is 27819031.

It can be written as a sum of positive squares in only one way, i.e., 9265936 + 3825936 = 3044^2 + 1956^2 .

It is a super-2 number, since 2×13091872² = 342794224928768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13091873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204529 + ... + 204592.

Almost surely, 2^13091872 is an apocalyptic number.

It is an amenable number.

13091872 is a deficient number, since it is larger than the sum of its proper divisors (12682814).

13091872 is an equidigital number, since it uses as much as digits as its factorization.

13091872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409131 (or 409123 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 13091872 is about 3618.2691994930. The cubic root of 13091872 is about 235.6860711517.

The spelling of 13091872 in words is "thirteen million, ninety-one thousand, eight hundred seventy-two".