18685636 has 12 divisors (see below), whose sum is σ = 32749612. Its totient is φ = 9328608.

The previous prime is 18685621. The next prime is 18685651. The reversal of 18685636 is 63658681.

It is an interprime number because it is at equal distance from previous prime (18685621) and next prime (18685651).

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 1512900 = 4144^2 + 1230^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18685592 and 18685601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255 + ... + 6118.

Almost surely, 2^18685636 is an apocalyptic number.

It is an amenable number.

18685636 is a deficient number, since it is larger than the sum of its proper divisors (14063976).

18685636 is a wasteful number, since it uses less digits than its factorization.

18685636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110 (or 7108 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 18685636 is about 4322.6885152645. The cubic root of 18685636 is about 265.3603073228.

It can be divided in two parts, 18685 and 636, that added together give a square (19321 = 139²).

The spelling of 18685636 in words is "eighteen million, six hundred eighty-five thousand, six hundred thirty-six".