18120685 has 16 divisors (see below), whose sum is σ = 23804352. Its totient is φ = 13132800.

The previous prime is 18120653. The next prime is 18120689. The reversal of 18120685 is 58602181.

It is not a de Polignac number, because 18120685 - 2⁵ = 18120653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120689) 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, 31117 + ... + 31693.

It is an arithmetic number, because the mean of its divisors is an integer number (1487772).

Almost surely, 2^18120685 is an apocalyptic number.

It is an amenable number.

18120685 is a deficient number, since it is larger than the sum of its proper divisors (5683667).

18120685 is a wasteful number, since it uses less digits than its factorization.

18120685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 18120685 is about 4256.8397902670. The cubic root of 18120685 is about 262.6585466997.

The spelling of 18120685 in words is "eighteen million, one hundred twenty thousand, six hundred eighty-five".