18144685 has 24 divisors (see below), whose sum is σ = 23914440. Its totient is φ = 13208832.

The previous prime is 18144619. The next prime is 18144701. The reversal of 18144685 is 58644181.

It can be written as a sum of positive squares in 12 ways, for example, as 3175524 + 14969161 = 1782^2 + 3869^2 .

It is not a de Polignac number, because 18144685 - 2⁷ = 18144557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92007 + ... + 92203.

It is an arithmetic number, because the mean of its divisors is an integer number (996435).

Almost surely, 2^18144685 is an apocalyptic number.

It is an amenable number.

18144685 is a deficient number, since it is larger than the sum of its proper divisors (5769755).

18144685 is a wasteful number, since it uses less digits than its factorization.

18144685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 324 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 18144685 is about 4259.6578501096. The cubic root of 18144685 is about 262.7744551976.

The spelling of 18144685 in words is "eighteen million, one hundred forty-four thousand, six hundred eighty-five".