18307044 has 36 divisors (see below), whose sum is σ = 52887744. Its totient is φ = 5230512.

The previous prime is 18307039. The next prime is 18307049. The reversal of 18307044 is 44070381.

It is an interprime number because it is at equal distance from previous prime (18307039) and next prime (18307049).

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 18306999 and 18307017.

It is not an unprimeable number, because it can be changed into a prime (18307049) 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, 36072 + ... + 36575.

It is an arithmetic number, because the mean of its divisors is an integer number (1469104).

Almost surely, 2^18307044 is an apocalyptic number.

18307044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18307044 is an abundant number, since it is smaller than the sum of its proper divisors (34580700).

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

18307044 is a wasteful number, since it uses less digits than its factorization.

18307044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72664 (or 72659 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18307044 is about 4278.6731588192. The cubic root of 18307044 is about 263.5558993586. Note that the first 3 decimals are identical.

The spelling of 18307044 in words is "eighteen million, three hundred seven thousand, forty-four".