13621572 has 36 divisors (see below), whose sum is σ = 34559616. Its totient is φ = 4523760.

The previous prime is 13621549. The next prime is 13621577. The reversal of 13621572 is 27512631.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (13621577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12697 + ... + 13727.

Almost surely, 2^13621572 is an apocalyptic number.

13621572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13621572 is an abundant number, since it is smaller than the sum of its proper divisors (20938044).

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

13621572 is a wasteful number, since it uses less digits than its factorization.

13621572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408 (or 1403 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 13621572 is about 3690.7413889353. The cubic root of 13621572 is about 238.8227767135.

The spelling of 13621572 in words is "thirteen million, six hundred twenty-one thousand, five hundred seventy-two".