18889856 has 32 divisors (see below), whose sum is σ = 39850380. Its totient is φ = 8888320.

The previous prime is 18889841. The next prime is 18889909. The reversal of 18889856 is 65898881.

It can be written as a sum of positive squares in 2 ways, for example, as 16974400 + 1915456 = 4120^2 + 1384^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 18889798 and 18889807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165 + ... + 6516.

Almost surely, 2^18889856 is an apocalyptic number.

18889856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18889856 is an abundant number, since it is smaller than the sum of its proper divisors (20960524).

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

18889856 is an equidigital number, since it uses as much as digits as its factorization.

18889856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712 (or 8700 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 53.

The square root of 18889856 is about 4346.2461964320. The cubic root of 18889856 is about 266.3235364484.

The spelling of 18889856 in words is "eighteen million, eight hundred eighty-nine thousand, eight hundred fifty-six".