18983980 has 48 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 7212800.

The previous prime is 18983971. The next prime is 18983989. The reversal of 18983980 is 8938981.

It is an interprime number because it is at equal distance from previous prime (18983971) and next prime (18983989).

It is a self number, because there is not a number n which added to its sum of digits gives 18983980.

It is not an unprimeable number, because it can be changed into a prime (18983989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40950 + ... + 41410.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^18983980 is an apocalyptic number.

18983980 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 18983980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956320).

18983980 is an abundant number, since it is smaller than the sum of its proper divisors (22928660).

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

18983980 is a wasteful number, since it uses less digits than its factorization.

18983980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18983980 is about 4357.0609359980. The cubic root of 18983980 is about 266.7651476539.

The spelling of 18983980 in words is "eighteen million, nine hundred eighty-three thousand, nine hundred eighty".