18685056 has 128 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 5419008.

The previous prime is 18685049. The next prime is 18685067. The reversal of 18685056 is 65058681.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94750 + ... + 94946.

Almost surely, 2^18685056 is an apocalyptic number.

18685056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18685056 is the 2496-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18685056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28274400).

18685056 is an abundant number, since it is smaller than the sum of its proper divisors (37863744).

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

18685056 is a wasteful number, since it uses less digits than its factorization.

18685056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 18685056 is about 4322.6214268659. The cubic root of 18685056 is about 265.3575617099.

The spelling of 18685056 in words is "eighteen million, six hundred eighty-five thousand, fifty-six".