18407985 has 16 divisors (see below), whose sum is σ = 29522880. Its totient is φ = 9794240.

The previous prime is 18407947. The next prime is 18407993. The reversal of 18407985 is 58970481.

It is not a de Polignac number, because 18407985 - 2¹⁶ = 18342449 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6430 + ... + 8840.

It is an arithmetic number, because the mean of its divisors is an integer number (1845180).

Almost surely, 2^18407985 is an apocalyptic number.

18407985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18407985 is a deficient number, since it is larger than the sum of its proper divisors (11114895).

18407985 is a wasteful number, since it uses less digits than its factorization.

18407985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18407985 is about 4290.4527733096. The cubic root of 18407985 is about 264.0394081438.

The spelling of 18407985 in words is "eighteen million, four hundred seven thousand, nine hundred eighty-five".