13213644 has 48 divisors (see below), whose sum is σ = 32006016. Its totient is φ = 4240000.

The previous prime is 13213579. The next prime is 13213667. The reversal of 13213644 is 44631231.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52519 + ... + 52769.

It is an arithmetic number, because the mean of its divisors is an integer number (666792).

Almost surely, 2^13213644 is an apocalyptic number.

It is an amenable number.

13213644 is an abundant number, since it is smaller than the sum of its proper divisors (18792372).

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

13213644 is a wasteful number, since it uses less digits than its factorization.

13213644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 404 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 13213644 is about 3635.0576336559. The cubic root of 13213644 is about 236.4145495667.

Adding to 13213644 its reverse (44631231), we get a palindrome (57844875).

The spelling of 13213644 in words is "thirteen million, two hundred thirteen thousand, six hundred forty-four".