18868136 has 48 divisors (see below), whose sum is σ = 41587200. Its totient is φ = 8001504.

The previous prime is 18868133. The next prime is 18868139. The reversal of 18868136 is 63186881.

It is an interprime number because it is at equal distance from previous prime (18868133) and next prime (18868139).

It is a super-2 number, since 2×18868136² = 712013112228992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18868093 and 18868102.

It is not an unprimeable number, because it can be changed into a prime (18868133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49595 + ... + 49973.

It is an arithmetic number, because the mean of its divisors is an integer number (866400).

Almost surely, 2^18868136 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 18868136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20793600).

18868136 is an abundant number, since it is smaller than the sum of its proper divisors (22719064).

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

18868136 is a wasteful number, since it uses less digits than its factorization.

18868136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 515 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 18868136 is about 4343.7467697830. The cubic root of 18868136 is about 266.2214222819.

The spelling of 18868136 in words is "eighteen million, eight hundred sixty-eight thousand, one hundred thirty-six".