18508516 has 12 divisors (see below), whose sum is σ = 34881532. Its totient is φ = 8542368.

The previous prime is 18508513. The next prime is 18508541. The reversal of 18508516 is 61580581.

It can be written as a sum of positive squares in 2 ways, for example, as 2073600 + 16434916 = 1440^2 + 4054^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18508513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177915 + ... + 178018.

Almost surely, 2^18508516 is an apocalyptic number.

It is an amenable number.

18508516 is a deficient number, since it is larger than the sum of its proper divisors (16373016).

18508516 is a wasteful number, since it uses less digits than its factorization.

18508516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355950 (or 355948 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 18508516 is about 4302.1524845128. The cubic root of 18508516 is about 264.5191993906.

The spelling of 18508516 in words is "eighteen million, five hundred eight thousand, five hundred sixteen".