18133979 has 4 divisors (see below), whose sum is σ = 18169176. Its totient is φ = 18098784.

The previous prime is 18133967. The next prime is 18133987. The reversal of 18133979 is 97933181.

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 18133979 - 2¹² = 18129883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18133909) 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, 16814 + ... + 17859.

It is an arithmetic number, because the mean of its divisors is an integer number (4542294).

Almost surely, 2^18133979 is an apocalyptic number.

18133979 is a deficient number, since it is larger than the sum of its proper divisors (35197).

18133979 is an equidigital number, since it uses as much as digits as its factorization.

18133979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35196.

The product of its digits is 40824, while the sum is 41.

The square root of 18133979 is about 4258.4009909824. The cubic root of 18133979 is about 262.7227629838.

The spelling of 18133979 in words is "eighteen million, one hundred thirty-three thousand, nine hundred seventy-nine".