13872521 has 16 divisors (see below), whose sum is σ = 15525888. Its totient is φ = 12312000.

The previous prime is 13872517. The next prime is 13872533. The reversal of 13872521 is 12527831.

It is a cyclic number.

It is not a de Polignac number, because 13872521 - 2² = 13872517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13872511) 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 15 ways as a sum of consecutive naturals, for example, 72536 + ... + 72726.

It is an arithmetic number, because the mean of its divisors is an integer number (970368).

Almost surely, 2^13872521 is an apocalyptic number.

It is an amenable number.

13872521 is a deficient number, since it is larger than the sum of its proper divisors (1653367).

13872521 is a wasteful number, since it uses less digits than its factorization.

13872521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its digits is 3360, while the sum is 29.

The square root of 13872521 is about 3724.5833324011. The cubic root of 13872521 is about 240.2804649440.

The spelling of 13872521 in words is "thirteen million, eight hundred seventy-two thousand, five hundred twenty-one".