18630636 has 12 divisors (see below), whose sum is σ = 43471512. Its totient is φ = 6210208.

The previous prime is 18630631. The next prime is 18630679. The reversal of 18630636 is 63603681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18630597 and 18630606.

It is not an unprimeable number, because it can be changed into a prime (18630631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776265 + ... + 776288.

It is an arithmetic number, because the mean of its divisors is an integer number (3622626).

Almost surely, 2^18630636 is an apocalyptic number.

It is an amenable number.

18630636 is an abundant number, since it is smaller than the sum of its proper divisors (24840876).

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

18630636 is a wasteful number, since it uses less digits than its factorization.

18630636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552560 (or 1552558 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 18630636 is about 4316.3220454456. The cubic root of 18630636 is about 265.0996943042.

The spelling of 18630636 in words is "eighteen million, six hundred thirty thousand, six hundred thirty-six".