18328980 has 24 divisors (see below), whose sum is σ = 51321312. Its totient is φ = 4887712.

The previous prime is 18328979. The next prime is 18328987. The reversal of 18328980 is 8982381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328987) 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 7 ways as a sum of consecutive naturals, for example, 152682 + ... + 152801.

It is an arithmetic number, because the mean of its divisors is an integer number (2138388).

Almost surely, 2^18328980 is an apocalyptic number.

18328980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18328980 is an abundant number, since it is smaller than the sum of its proper divisors (32992332).

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

18328980 is a wasteful number, since it uses less digits than its factorization.

18328980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305495 (or 305493 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 18328980 is about 4281.2358028962. The cubic root of 18328980 is about 263.6611239671.

The spelling of 18328980 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred eighty".