18408959 has 4 divisors (see below), whose sum is σ = 18858000. Its totient is φ = 17959920.

The previous prime is 18408953. The next prime is 18408979. The reversal of 18408959 is 95980481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18408959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408953) 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, 224459 + ... + 224540.

It is an arithmetic number, because the mean of its divisors is an integer number (4714500).

Almost surely, 2^18408959 is an apocalyptic number.

18408959 is a deficient number, since it is larger than the sum of its proper divisors (449041).

18408959 is an equidigital number, since it uses as much as digits as its factorization.

18408959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449040.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18408959 is about 4290.5662796419. The cubic root of 18408959 is about 264.0440649969.

The spelling of 18408959 in words is "eighteen million, four hundred eight thousand, nine hundred fifty-nine".