18140864 has 28 divisors (see below), whose sum is σ = 41141904. Its totient is φ = 7774464.

The previous prime is 18140861. The next prime is 18140867. The reversal of 18140864 is 46804181.

It is an interprime number because it is at equal distance from previous prime (18140861) and next prime (18140867).

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 18140864.

It is not an unprimeable number, because it can be changed into a prime (18140861) 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, 19799 + ... + 20694.

Almost surely, 2^18140864 is an apocalyptic number.

18140864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18140864 is an abundant number, since it is smaller than the sum of its proper divisors (23001040).

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

18140864 is an equidigital number, since it uses as much as digits as its factorization.

18140864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40512 (or 40502 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18140864 is about 4259.2093162933. The cubic root of 18140864 is about 262.7560084425.

The spelling of 18140864 in words is "eighteen million, one hundred forty thousand, eight hundred sixty-four".