18308280 has 64 divisors (see below), whose sum is σ = 56829600. Its totient is φ = 4712960.

The previous prime is 18308261. The next prime is 18308281. The reversal of 18308280 is 8280381.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850 + ... + 6110.

Almost surely, 2^18308280 is an apocalyptic number.

18308280 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 18308280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28414800).

18308280 is an abundant number, since it is smaller than the sum of its proper divisors (38521320).

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

18308280 is a wasteful number, since it uses less digits than its factorization.

18308280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304 (or 5300 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18308280 is about 4278.8175936817. The cubic root of 18308280 is about 263.5618305503.

The spelling of 18308280 in words is "eighteen million, three hundred eight thousand, two hundred eighty".