18312280 has 48 divisors (see below), whose sum is σ = 47934720. Its totient is φ = 6277824.

The previous prime is 18312263. The next prime is 18312319. The reversal of 18312280 is 8221381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2712 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (998640).

Almost surely, 2^18312280 is an apocalyptic number.

18312280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18312280 is an abundant number, since it is smaller than the sum of its proper divisors (29622440).

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

18312280 is a wasteful number, since it uses less digits than its factorization.

18312280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368 (or 9357 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18312280 is about 4279.2849870043. The cubic root of 18312280 is about 263.5810235157.

The spelling of 18312280 in words is "eighteen million, three hundred twelve thousand, two hundred eighty".