18569997 has 12 divisors (see below), whose sum is σ = 26975520. Its totient is φ = 12309768.

The previous prime is 18569989. The next prime is 18570017. The reversal of 18569997 is 79996581.

It is not a de Polignac number, because 18569997 - 2³ = 18569989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18569927) 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 11 ways as a sum of consecutive naturals, for example, 4153 + ... + 7374.

It is an arithmetic number, because the mean of its divisors is an integer number (2247960).

Almost surely, 2^18569997 is an apocalyptic number.

It is an amenable number.

18569997 is a deficient number, since it is larger than the sum of its proper divisors (8405523).

18569997 is a wasteful number, since it uses less digits than its factorization.

18569997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11712 (or 11709 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 18569997 is about 4309.2919371980. The cubic root of 18569997 is about 264.8117661718.

The spelling of 18569997 in words is "eighteen million, five hundred sixty-nine thousand, nine hundred ninety-seven".