18386564 has 18 divisors (see below), whose sum is σ = 37430190. Its totient is φ = 7879872.

The previous prime is 18386561. The next prime is 18386579. The reversal of 18386564 is 46568381.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 153664 = 4270^2 + 392^2 .

It is not an unprimeable number, because it can be changed into a prime (18386561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46709 + ... + 47100.

It is an arithmetic number, because the mean of its divisors is an integer number (2079455).

Almost surely, 2^18386564 is an apocalyptic number.

18386564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18386564 is an abundant number, since it is smaller than the sum of its proper divisors (19043626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18386564 is a wasteful number, since it uses less digits than its factorization.

18386564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93827 (or 93818 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 18386564 is about 4287.9556900696. The cubic root of 18386564 is about 263.9369492833.

The spelling of 18386564 in words is "eighteen million, three hundred eighty-six thousand, five hundred sixty-four".