13538621 has 8 divisors (see below), whose sum is σ = 14743200. Its totient is φ = 12383280.

The previous prime is 13538597. The next prime is 13538627. The reversal of 13538621 is 12683531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13538621 - 2⁶ = 13538557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13538627) 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, 11735 + ... + 12836.

It is an arithmetic number, because the mean of its divisors is an integer number (1842900).

Almost surely, 2^13538621 is an apocalyptic number.

It is an amenable number.

13538621 is a deficient number, since it is larger than the sum of its proper divisors (1204579).

13538621 is a wasteful number, since it uses less digits than its factorization.

13538621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24619.

The product of its digits is 4320, while the sum is 29.

The square root of 13538621 is about 3679.4865130885. The cubic root of 13538621 is about 238.3370046326.

The spelling of 13538621 in words is "thirteen million, five hundred thirty-eight thousand, six hundred twenty-one".