12531996 has 36 divisors (see below), whose sum is σ = 32853912. Its totient is φ = 4177008.

The previous prime is 12531977. The next prime is 12532061. The reversal of 12531996 is 69913521.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 12531996.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5475 + ... + 7418.

Almost surely, 2^12531996 is an apocalyptic number.

It is an amenable number.

12531996 is an abundant number, since it is smaller than the sum of its proper divisors (20321916).

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

12531996 is a wasteful number, since it uses less digits than its factorization.

12531996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12912 (or 12898 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 12531996 is about 3540.0559317615. The cubic root of 12531996 is about 232.2772893361.

It can be divided in two parts, 1253 and 1996, that added together give a square (3249 = 57²).

The spelling of 12531996 in words is "twelve million, five hundred thirty-one thousand, nine hundred ninety-six".