18380940 has 24 divisors (see below), whose sum is σ = 51466800. Its totient is φ = 4901568.

The previous prime is 18380917. The next prime is 18380941. The reversal of 18380940 is 4908381.

It is not an unprimeable number, because it can be changed into a prime (18380941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153115 + ... + 153234.

It is an arithmetic number, because the mean of its divisors is an integer number (2144450).

Almost surely, 2^18380940 is an apocalyptic number.

18380940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18380940 is an abundant number, since it is smaller than the sum of its proper divisors (33085860).

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

18380940 is a wasteful number, since it uses less digits than its factorization.

18380940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306361 (or 306359 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18380940 is about 4287.2998495557. The cubic root of 18380940 is about 263.9100359210.

The spelling of 18380940 in words is "eighteen million, three hundred eighty thousand, nine hundred forty".