18418564 has 6 divisors (see below), whose sum is σ = 32232494. Its totient is φ = 9209280.

The previous prime is 18418559. The next prime is 18418571. The reversal of 18418564 is 46581481.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 3534400 = 3858^2 + 1880^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2302317 + ... + 2302324.

Almost surely, 2^18418564 is an apocalyptic number.

It is an amenable number.

18418564 is a deficient number, since it is larger than the sum of its proper divisors (13813930).

18418564 is a wasteful number, since it uses less digits than its factorization.

18418564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604645 (or 4604643 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 18418564 is about 4291.6854497971. The cubic root of 18418564 is about 264.0899792768.

The spelling of 18418564 in words is "eighteen million, four hundred eighteen thousand, five hundred sixty-four".