18019656 has 48 divisors (see below), whose sum is σ = 49280400. Its totient is φ = 5947872.

The previous prime is 18019637. The next prime is 18019667. The reversal of 18019656 is 65691081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18019656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6535 + ... + 8873.

It is an arithmetic number, because the mean of its divisors is an integer number (1026675).

Almost surely, 2^18019656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18019656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24640200).

18019656 is an abundant number, since it is smaller than the sum of its proper divisors (31260744).

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

18019656 is a wasteful number, since it uses less digits than its factorization.

18019656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2451 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18019656 is about 4244.9565368800. The cubic root of 18019656 is about 262.1694997049.

The spelling of 18019656 in words is "eighteen million, nineteen thousand, six hundred fifty-six".