18368516 has 12 divisors (see below), whose sum is σ = 33836880. Its totient is φ = 8700840.

The previous prime is 18368509. The next prime is 18368521. The reversal of 18368516 is 61586381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 18368516.

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, 120770 + ... + 120921.

It is an arithmetic number, because the mean of its divisors is an integer number (2819740).

Almost surely, 2^18368516 is an apocalyptic number.

It is an amenable number.

18368516 is a deficient number, since it is larger than the sum of its proper divisors (15468364).

18368516 is a wasteful number, since it uses less digits than its factorization.

18368516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241714 (or 241712 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 18368516 is about 4285.8506740203. The cubic root of 18368516 is about 263.8505620439.

The spelling of 18368516 in words is "eighteen million, three hundred sixty-eight thousand, five hundred sixteen".