18679980 has 144 divisors (see below), whose sum is σ = 60060672. Its totient is φ = 4329600.

The previous prime is 18679967. The next prime is 18679987. The reversal of 18679980 is 8997681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 225019 + ... + 225101.

It is an arithmetic number, because the mean of its divisors is an integer number (417088).

Almost surely, 2^18679980 is an apocalyptic number.

18679980 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 18679980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30030336).

18679980 is an abundant number, since it is smaller than the sum of its proper divisors (41380692).

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

18679980 is a wasteful number, since it uses less digits than its factorization.

18679980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 18679980 is about 4322.0342432702. The cubic root of 18679980 is about 265.3335304382. Note that the first 3 decimals are identical.

The spelling of 18679980 in words is "eighteen million, six hundred seventy-nine thousand, nine hundred eighty".