13231812 has 48 divisors (see below), whose sum is σ = 34272000. Its totient is φ = 3939360.

The previous prime is 13231811. The next prime is 13231819. The reversal of 13231812 is 21813231.

13231812 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13231811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6939 + ... + 8637.

It is an arithmetic number, because the mean of its divisors is an integer number (714000).

Almost surely, 2^13231812 is an apocalyptic number.

13231812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13231812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17136000).

13231812 is an abundant number, since it is smaller than the sum of its proper divisors (21040188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13231812 is a wasteful number, since it uses less digits than its factorization.

13231812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1774 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 13231812 is about 3637.5557727683. Note that the first 3 decimals coincide. The cubic root of 13231812 is about 236.5228520783.

The spelling of 13231812 in words is "thirteen million, two hundred thirty-one thousand, eight hundred twelve".