18180940 has 12 divisors (see below), whose sum is σ = 38180016. Its totient is φ = 7272368.

The previous prime is 18180937. The next prime is 18180979. The reversal of 18180940 is 4908181.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454504 + ... + 454543.

It is an arithmetic number, because the mean of its divisors is an integer number (3181668).

Almost surely, 2^18180940 is an apocalyptic number.

18180940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18180940 is an abundant number, since it is smaller than the sum of its proper divisors (19999076).

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

18180940 is a wasteful number, since it uses less digits than its factorization.

18180940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909056 (or 909054 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18180940 is about 4263.9113499227. The cubic root of 18180940 is about 262.9493558120.

The spelling of 18180940 in words is "eighteen million, one hundred eighty thousand, nine hundred forty".