18408665 has 16 divisors (see below), whose sum is σ = 24235200. Its totient is φ = 13312320.

The previous prime is 18408661. The next prime is 18408679. The reversal of 18408665 is 56680481.

It is not a de Polignac number, because 18408665 - 2² = 18408661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18408661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9986 + ... + 11684.

It is an arithmetic number, because the mean of its divisors is an integer number (1514700).

Almost surely, 2^18408665 is an apocalyptic number.

It is an amenable number.

18408665 is a deficient number, since it is larger than the sum of its proper divisors (5826535).

18408665 is a wasteful number, since it uses less digits than its factorization.

18408665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 18408665 is about 4290.5320182933. The cubic root of 18408665 is about 264.0426593522.

The spelling of 18408665 in words is "eighteen million, four hundred eight thousand, six hundred sixty-five".