18865900 has 36 divisors (see below), whose sum is σ = 41450472. Its totient is φ = 7452160.

The previous prime is 18865883. The next prime is 18865909. The reversal of 18865900 is 956881.

It is a self number, because there is not a number n which added to its sum of digits gives 18865900.

It is not an unprimeable number, because it can be changed into a prime (18865909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7164 + ... + 9436.

It is an arithmetic number, because the mean of its divisors is an integer number (1151402).

Almost surely, 2^18865900 is an apocalyptic number.

18865900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18865900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20725236).

18865900 is an abundant number, since it is smaller than the sum of its proper divisors (22584572).

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

18865900 is a wasteful number, since it uses less digits than its factorization.

18865900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 18865900 is about 4343.4893806708. The cubic root of 18865900 is about 266.2109055282.

The spelling of 18865900 in words is "eighteen million, eight hundred sixty-five thousand, nine hundred".