18418572 has 18 divisors (see below), whose sum is σ = 46558148. Its totient is φ = 6139512.

The previous prime is 18418571. The next prime is 18418573. The reversal of 18418572 is 27581481.

18418572 is a `hidden beast` number, since 1 + 84 + 1 + 8 + 572 = 666.

It is an interprime number because it is at equal distance from previous prime (18418571) and next prime (18418573).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 511627 = 18418572 / (1 + 8 + 4 + 1 + 8 + 5 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (18418571) 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, 255778 + ... + 255849.

Almost surely, 2^18418572 is an apocalyptic number.

18418572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18418572 is an abundant number, since it is smaller than the sum of its proper divisors (28139576).

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

18418572 is a wasteful number, since it uses less digits than its factorization.

18418572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511637 (or 511632 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 18418572 is about 4291.6863818317. The cubic root of 18418572 is about 264.0900175121.

The spelling of 18418572 in words is "eighteen million, four hundred eighteen thousand, five hundred seventy-two".