18228980 has 144 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 5322240.

The previous prime is 18228971. The next prime is 18228983. The reversal of 18228980 is 8982281.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228983) 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, 204776 + ... + 204864.

It is an arithmetic number, because the mean of its divisors is an integer number (359100).

Almost surely, 2^18228980 is an apocalyptic number.

18228980 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 18228980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855200).

18228980 is an abundant number, since it is smaller than the sum of its proper divisors (33481420).

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

18228980 is a wasteful number, since it uses less digits than its factorization.

18228980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18228980 is about 4269.5409589322. The cubic root of 18228980 is about 263.1807515726.

18228980 divided by its sum of digits (38) gives a triangular number (479710 = T₉₇₉).

The spelling of 18228980 in words is "eighteen million, two hundred twenty-eight thousand, nine hundred eighty".