13538539 has 4 divisors (see below), whose sum is σ = 15472624. Its totient is φ = 11604456.

The previous prime is 13538533. The next prime is 13538543. The reversal of 13538539 is 93583531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13538539 - 2³ = 13538531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13538498 and 13538507.

It is not an unprimeable number, because it can be changed into a prime (13538531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967032 + ... + 967045.

It is an arithmetic number, because the mean of its divisors is an integer number (3868156).

Almost surely, 2^13538539 is an apocalyptic number.

13538539 is a deficient number, since it is larger than the sum of its proper divisors (1934085).

13538539 is an equidigital number, since it uses as much as digits as its factorization.

13538539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934084.

The product of its digits is 48600, while the sum is 37.

The square root of 13538539 is about 3679.4753702124. The cubic root of 13538539 is about 238.3365234493.

It can be divided in two parts, 135385 and 39, that added together give a square (135424 = 368²).

The spelling of 13538539 in words is "thirteen million, five hundred thirty-eight thousand, five hundred thirty-nine".