18856 has 8 divisors (see below), whose sum is σ = 35370. Its totient is φ = 9424.

The previous prime is 18839. The next prime is 18859. The reversal of 18856 is 65881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17956 + 900 = 134^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18859) by changing a digit.

18856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1171 + ... + 1186.

2¹⁸⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

18856 is a deficient number, since it is larger than the sum of its proper divisors (16514).

18856 is a wasteful number, since it uses less digits than its factorization.

18856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363 (or 2359 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 18856 is about 137.3171511502. The cubic root of 18856 is about 26.6164332097.

It can be divided in two parts, 1885 and 6, that added together give a triangular number (1891 = T₆₁).

The spelling of 18856 in words is "eighteen thousand, eight hundred fifty-six".