18512008 has 16 divisors (see below), whose sum is σ = 34770060. Its totient is φ = 9240000.

The previous prime is 18511979. The next prime is 18512029. The reversal of 18512008 is 80021581.

It can be written as a sum of positive squares in 2 ways, for example, as 18472804 + 39204 = 4298^2 + 198^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3958 + ... + 7258.

Almost surely, 2^18512008 is an apocalyptic number.

It is an amenable number.

18512008 is a deficient number, since it is larger than the sum of its proper divisors (16258052).

18512008 is a wasteful number, since it uses less digits than its factorization.

18512008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008 (or 4004 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18512008 is about 4302.5583087275. The cubic root of 18512008 is about 264.5358339488.

Adding to 18512008 its reverse (80021581), we get a palindrome (98533589).

The spelling of 18512008 in words is "eighteen million, five hundred twelve thousand, eight".