13231918 has 16 divisors (see below), whose sum is σ = 22740480. Its totient is φ = 5656536.

The previous prime is 13231913. The next prime is 13231921. The reversal of 13231918 is 81913231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231913) 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, 6103 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^13231918 is an apocalyptic number.

13231918 is a deficient number, since it is larger than the sum of its proper divisors (9508562).

13231918 is a wasteful number, since it uses less digits than its factorization.

13231918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391.

The product of its digits is 1296, while the sum is 28.

The square root of 13231918 is about 3637.5703429625. The cubic root of 13231918 is about 236.5234836712.

The spelling of 13231918 in words is "thirteen million, two hundred thirty-one thousand, nine hundred eighteen".