18706636 has 24 divisors (see below), whose sum is σ = 36789984. Its totient is φ = 8257920.

The previous prime is 18706603. The next prime is 18706637. The reversal of 18706636 is 63660781.

It is a junction number, because it is equal to n+sod(n) for n = 18706595 and 18706604.

It is not an unprimeable number, because it can be changed into a prime (18706637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6625 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (1532916).

Almost surely, 2^18706636 is an apocalyptic number.

It is an amenable number.

18706636 is a deficient number, since it is larger than the sum of its proper divisors (18083348).

18706636 is a wasteful number, since it uses less digits than its factorization.

18706636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15681 (or 15679 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 18706636 is about 4325.1168770335. The cubic root of 18706636 is about 265.4596791998.

It can be divided in two parts, 187066 and 36, that multiplied together give a palindrome (6734376).

The spelling of 18706636 in words is "eighteen million, seven hundred six thousand, six hundred thirty-six".