12631440 has 40 divisors (see below), whose sum is σ = 39158208. Its totient is φ = 3368320.

The previous prime is 12631429. The next prime is 12631471. The reversal of 12631440 is 4413621.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26076 + ... + 26555.

Almost surely, 2^12631440 is an apocalyptic number.

12631440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12631440 is an abundant number, since it is smaller than the sum of its proper divisors (26526768).

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

12631440 is a wasteful number, since it uses less digits than its factorization.

12631440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52647 (or 52641 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 12631440 is about 3554.0737189878. The cubic root of 12631440 is about 232.8900609258.

The spelling of 12631440 in words is "twelve million, six hundred thirty-one thousand, four hundred forty".