18898564 has 24 divisors (see below), whose sum is σ = 34234200. Its totient is φ = 9121536.

The previous prime is 18898553. The next prime is 18898591. The reversal of 18898564 is 46589881.

It can be written as a sum of positive squares in 4 ways, for example, as 7064964 + 11833600 = 2658^2 + 3440^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21624 + ... + 22480.

It is an arithmetic number, because the mean of its divisors is an integer number (1426425).

Almost surely, 2^18898564 is an apocalyptic number.

It is an amenable number.

18898564 is a deficient number, since it is larger than the sum of its proper divisors (15335636).

18898564 is a wasteful number, since it uses less digits than its factorization.

18898564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047 (or 1045 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 18898564 is about 4347.2478650291. The cubic root of 18898564 is about 266.3644541607.

The spelling of 18898564 in words is "eighteen million, eight hundred ninety-eight thousand, five hundred sixty-four".