18119985 has 32 divisors (see below), whose sum is σ = 31963008. Its totient is φ = 8709120.

The previous prime is 18119971. The next prime is 18120007. The reversal of 18119985 is 58991181.

It is not a de Polignac number, because 18119985 - 2⁶ = 18119921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7305 + ... + 9465.

It is an arithmetic number, because the mean of its divisors is an integer number (998844).

Almost surely, 2^18119985 is an apocalyptic number.

18119985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18119985 is a deficient number, since it is larger than the sum of its proper divisors (13843023).

18119985 is a wasteful number, since it uses less digits than its factorization.

18119985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225.

The product of its digits is 25920, while the sum is 42.

The square root of 18119985 is about 4256.7575688545. The cubic root of 18119985 is about 262.6551644996.

The spelling of 18119985 in words is "eighteen million, one hundred nineteen thousand, nine hundred eighty-five".