18740864 has 32 divisors (see below), whose sum is σ = 38547840. Its totient is φ = 9066240.

The previous prime is 18740863. The next prime is 18740867. The reversal of 18740864 is 46804781.

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

It is not an unprimeable number, because it can be changed into a prime (18740861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1607 + ... + 6329.

It is an arithmetic number, because the mean of its divisors is an integer number (1204620).

Almost surely, 2^18740864 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 18740864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19273920).

18740864 is an abundant number, since it is smaller than the sum of its proper divisors (19806976).

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

18740864 is an equidigital number, since it uses as much as digits as its factorization.

18740864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4768 (or 4756 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 18740864 is about 4329.0719559739. The cubic root of 18740864 is about 265.6214866248.

The spelling of 18740864 in words is "eighteen million, seven hundred forty thousand, eight hundred sixty-four".