18313280 has 56 divisors (see below), whose sum is σ = 44013120. Its totient is φ = 7257600.

The previous prime is 18313277. The next prime is 18313289. The reversal of 18313280 is 8231381.

It is not an unprimeable number, because it can be changed into a prime (18313289) 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, 48131 + ... + 48509.

Almost surely, 2^18313280 is an apocalyptic number.

18313280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22006560).

18313280 is an abundant number, since it is smaller than the sum of its proper divisors (25699840).

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

18313280 is a wasteful number, since it uses less digits than its factorization.

18313280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18313280 is about 4279.4018273586. The cubic root of 18313280 is about 263.5858213203.

The spelling of 18313280 in words is "eighteen million, three hundred thirteen thousand, two hundred eighty".