13312840 has 32 divisors (see below), whose sum is σ = 30099960. Its totient is φ = 5299200.

The previous prime is 13312813. The next prime is 13312841. The reversal of 13312840 is 4821331.

It can be written as a sum of positive squares in 4 ways, for example, as 11710084 + 1602756 = 3422^2 + 1266^2 .

It is not an unprimeable number, because it can be changed into a prime (13312841) 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, 8950 + ... + 10330.

Almost surely, 2^13312840 is an apocalyptic number.

13312840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13312840 is an abundant number, since it is smaller than the sum of its proper divisors (16787120).

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

13312840 is a wasteful number, since it uses less digits than its factorization.

13312840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 13312840 is about 3648.6764723664. The cubic root of 13312840 is about 237.0046703371.

The spelling of 13312840 in words is "thirteen million, three hundred twelve thousand, eight hundred forty".