18157636 has 18 divisors (see below), whose sum is σ = 36964158. Its totient is φ = 7781760.

The previous prime is 18157619. The next prime is 18157637. The reversal of 18157636 is 63675181.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 44100 = 4256^2 + 210^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18157595 and 18157604.

It is not an unprimeable number, because it can be changed into a prime (18157637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46125 + ... + 46516.

Almost surely, 2^18157636 is an apocalyptic number.

It is an amenable number.

18157636 is an abundant number, since it is smaller than the sum of its proper divisors (18806522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18157636 is a wasteful number, since it uses less digits than its factorization.

18157636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92659 (or 92650 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 18157636 is about 4261.1777714618. The cubic root of 18157636 is about 262.8369598667.

The spelling of 18157636 in words is "eighteen million, one hundred fifty-seven thousand, six hundred thirty-six".