18315280 has 40 divisors (see below), whose sum is σ = 42854400. Its totient is φ = 7279488.

The previous prime is 18315257. The next prime is 18315301. The reversal of 18315280 is 8251381.

It is a tau number, because it is divible by the number of its divisors (40).

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, 13681 + ... + 14959.

It is an arithmetic number, because the mean of its divisors is an integer number (1071360).

Almost surely, 2^18315280 is an apocalyptic number.

18315280 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 18315280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21427200).

18315280 is an abundant number, since it is smaller than the sum of its proper divisors (24539120).

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

18315280 is a wasteful number, since it uses less digits than its factorization.

18315280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18315280 is about 4279.6354984975. The cubic root of 18315280 is about 263.5954164056.

The spelling of 18315280 in words is "eighteen million, three hundred fifteen thousand, two hundred eighty".