18377985 has 16 divisors (see below), whose sum is σ = 30089664. Its totient is φ = 9573312.

The previous prime is 18377971. The next prime is 18377993. The reversal of 18377985 is 58977381.

It is not a de Polignac number, because 18377985 - 2¹⁴ = 18361601 is a prime.

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, 13602 + ... + 14891.

It is an arithmetic number, because the mean of its divisors is an integer number (1880604).

Almost surely, 2^18377985 is an apocalyptic number.

18377985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18377985 is a deficient number, since it is larger than the sum of its proper divisors (11711679).

18377985 is a wasteful number, since it uses less digits than its factorization.

18377985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28544.

The product of its digits is 423360, while the sum is 48.

The square root of 18377985 is about 4286.9552132020. The cubic root of 18377985 is about 263.8958927206.

The spelling of 18377985 in words is "eighteen million, three hundred seventy-seven thousand, nine hundred eighty-five".