18308268 has 90 divisors (see below), whose sum is σ = 52720668. Its totient is φ = 5536080.

The previous prime is 18308261. The next prime is 18308281. The reversal of 18308268 is 86280381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18308261) 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 29 ways as a sum of consecutive naturals, for example, 38971 + ... + 39437.

Almost surely, 2^18308268 is an apocalyptic number.

18308268 is a gapful number since it is divisible by the number (18) 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 18308268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26360334).

18308268 is an abundant number, since it is smaller than the sum of its proper divisors (34412400).

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

18308268 is a wasteful number, since it uses less digits than its factorization.

18308268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18308268 is about 4278.8161914249. The cubic root of 18308268 is about 263.5617729672.

The spelling of 18308268 in words is "eighteen million, three hundred eight thousand, two hundred sixty-eight".