18169139 has 4 divisors (see below), whose sum is σ = 18285024. Its totient is φ = 18053256.

The previous prime is 18169133. The next prime is 18169147. The reversal of 18169139 is 93196181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18169139 is a prime.

It is a super-2 number, since 2×18169139² = 660235224002642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18169133) 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 3 ways as a sum of consecutive naturals, for example, 57707 + ... + 58020.

It is an arithmetic number, because the mean of its divisors is an integer number (4571256).

Almost surely, 2^18169139 is an apocalyptic number.

18169139 is a deficient number, since it is larger than the sum of its proper divisors (115885).

18169139 is a wasteful number, since it uses less digits than its factorization.

18169139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115884.

The product of its digits is 11664, while the sum is 38.

The square root of 18169139 is about 4262.5273019653. The cubic root of 18169139 is about 262.8924512189.

The spelling of 18169139 in words is "eighteen million, one hundred sixty-nine thousand, one hundred thirty-nine".