18630644 has 24 divisors (see below), whose sum is σ = 35199360. Its totient is φ = 8601824.

The previous prime is 18630631. The next prime is 18630679. The reversal of 18630644 is 44603681.

It is a self number, because there is not a number n which added to its sum of digits gives 18630644.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 824 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (1466640).

Almost surely, 2^18630644 is an apocalyptic number.

It is an amenable number.

18630644 is a deficient number, since it is larger than the sum of its proper divisors (16568716).

18630644 is a wasteful number, since it uses less digits than its factorization.

18630644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7039 (or 7037 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 18630644 is about 4316.3229721604. The cubic root of 18630644 is about 265.0997322488.

The spelling of 18630644 in words is "eighteen million, six hundred thirty thousand, six hundred forty-four".