18683644 has 12 divisors (see below), whose sum is σ = 37367344. Its totient is φ = 8007264.

The previous prime is 18683641. The next prime is 18683647. The reversal of 18683644 is 44638681.

It is an interprime number because it is at equal distance from previous prime (18683641) and next prime (18683647).

18683644 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18683597 and 18683606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18683641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333609 + ... + 333664.

Almost surely, 2^18683644 is an apocalyptic number.

18683644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18683644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18683644 is a wasteful number, since it uses less digits than its factorization.

18683644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667284 (or 667282 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 18683644 is about 4322.4580969629. The cubic root of 18683644 is about 265.3508773251.

The spelling of 18683644 in words is "eighteen million, six hundred eighty-three thousand, six hundred forty-four".