18116788 has 6 divisors (see below), whose sum is σ = 31704386. Its totient is φ = 9058392.

The previous prime is 18116767. The next prime is 18116789. The reversal of 18116788 is 88761181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 4485924 = 3692^2 + 2118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18116788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18116789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2264595 + ... + 2264602.

Almost surely, 2^18116788 is an apocalyptic number.

It is an amenable number.

18116788 is a deficient number, since it is larger than the sum of its proper divisors (13587598).

18116788 is a wasteful number, since it uses less digits than its factorization.

18116788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4529201 (or 4529199 counting only the distinct ones).

The product of its digits is 21504, while the sum is 40.

The square root of 18116788 is about 4256.3820317260. The cubic root of 18116788 is about 262.6397164009.

The spelling of 18116788 in words is "eighteen million, one hundred sixteen thousand, seven hundred eighty-eight".