18399016 has 16 divisors (see below), whose sum is σ = 34544340. Its totient is φ = 9187200.

The previous prime is 18399001. The next prime is 18399023. The reversal of 18399016 is 61099381.

It can be written as a sum of positive squares in 2 ways, for example, as 18096516 + 302500 = 4254^2 + 550^2 .

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, 9316 + ... + 11116.

Almost surely, 2^18399016 is an apocalyptic number.

It is an amenable number.

18399016 is a deficient number, since it is larger than the sum of its proper divisors (16145324).

18399016 is a wasteful number, since it uses less digits than its factorization.

18399016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084 (or 3080 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 18399016 is about 4289.4074182805. The cubic root of 18399016 is about 263.9965181665.

It can be divided in two parts, 183 and 99016, that added together give a palindrome (99199).

The spelling of 18399016 in words is "eighteen million, three hundred ninety-nine thousand, sixteen".