18325139 has 16 divisors (see below), whose sum is σ = 22183680. Its totient is φ = 14787360.

The previous prime is 18325127. The next prime is 18325147. The reversal of 18325139 is 93152381.

It is not a de Polignac number, because 18325139 - 2²⁰ = 17276563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18325169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27737 + ... + 28389.

It is an arithmetic number, because the mean of its divisors is an integer number (1386480).

Almost surely, 2^18325139 is an apocalyptic number.

18325139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18325139 is a deficient number, since it is larger than the sum of its proper divisors (3858541).

18325139 is a wasteful number, since it uses less digits than its factorization.

18325139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its digits is 6480, while the sum is 32.

The square root of 18325139 is about 4280.7871939633. The cubic root of 18325139 is about 263.6427051730.

The spelling of 18325139 in words is "eighteen million, three hundred twenty-five thousand, one hundred thirty-nine".