18131340 has 24 divisors (see below), whose sum is σ = 50767920. Its totient is φ = 4835008.

The previous prime is 18131303. The next prime is 18131359. The reversal of 18131340 is 4313181.

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, 151035 + ... + 151154.

It is an arithmetic number, because the mean of its divisors is an integer number (2115330).

Almost surely, 2^18131340 is an apocalyptic number.

18131340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18131340 is an abundant number, since it is smaller than the sum of its proper divisors (32636580).

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

18131340 is a wasteful number, since it uses less digits than its factorization.

18131340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302201 (or 302199 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 18131340 is about 4258.0911216178. The cubic root of 18131340 is about 262.7100178676.

The spelling of 18131340 in words is "eighteen million, one hundred thirty-one thousand, three hundred forty".