18306880 has 56 divisors (see below), whose sum is σ = 45902880. Its totient is φ = 6935040.

The previous prime is 18306839. The next prime is 18306887. The reversal of 18306880 is 8860381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18306887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4575 + ... + 7585.

Almost surely, 2^18306880 is an apocalyptic number.

18306880 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 18306880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22951440).

18306880 is an abundant number, since it is smaller than the sum of its proper divisors (27596000).

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

18306880 is a wasteful number, since it uses less digits than its factorization.

18306880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047 (or 3037 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18306880 is about 4278.6539939565. The cubic root of 18306880 is about 263.5551123519. Note that the first 3 decimals are identical.

The spelling of 18306880 in words is "eighteen million, three hundred six thousand, eight hundred eighty".