18013980 has 24 divisors (see below), whose sum is σ = 50439312. Its totient is φ = 4803712.

The previous prime is 18013921. The next prime is 18013981. The reversal of 18013980 is 8931081.

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 (18013981) 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, 150057 + ... + 150176.

It is an arithmetic number, because the mean of its divisors is an integer number (2101638).

Almost surely, 2^18013980 is an apocalyptic number.

18013980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18013980 is an abundant number, since it is smaller than the sum of its proper divisors (32425332).

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

18013980 is a wasteful number, since it uses less digits than its factorization.

18013980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300245 (or 300243 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 18013980 is about 4244.2879261426. The cubic root of 18013980 is about 262.1419699461.

The spelling of 18013980 in words is "eighteen million, thirteen thousand, nine hundred eighty".