18304040 has 32 divisors (see below), whose sum is σ = 42192360. Its totient is φ = 7142400.

The previous prime is 18304037. The next prime is 18304051. The reversal of 18304040 is 4040381.

It can be written as a sum of positive squares in 4 ways, for example, as 4301476 + 14002564 = 2074^2 + 3742^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3941 + ... + 7220.

Almost surely, 2^18304040 is an apocalyptic number.

18304040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18304040 is an abundant number, since it is smaller than the sum of its proper divisors (23888320).

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

18304040 is a wasteful number, since it uses less digits than its factorization.

18304040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213 (or 11209 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18304040 is about 4278.3221010111. The cubic root of 18304040 is about 263.5414829545.

The spelling of 18304040 in words is "eighteen million, three hundred four thousand, forty".