18539913 has 32 divisors (see below), whose sum is σ = 29498112. Its totient is φ = 10137600.

The previous prime is 18539879. The next prime is 18539933. The reversal of 18539913 is 31993581.

It is not a de Polignac number, because 18539913 - 2⁸ = 18539657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18539933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52345 + ... + 52697.

It is an arithmetic number, because the mean of its divisors is an integer number (921816).

Almost surely, 2^18539913 is an apocalyptic number.

It is an amenable number.

18539913 is a deficient number, since it is larger than the sum of its proper divisors (10958199).

18539913 is a wasteful number, since it uses less digits than its factorization.

18539913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 29160, while the sum is 39.

The square root of 18539913 is about 4305.7999256816. The cubic root of 18539913 is about 264.6686876512.

The spelling of 18539913 in words is "eighteen million, five hundred thirty-nine thousand, nine hundred thirteen".