18981480 has 128 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 4253952.

The previous prime is 18981451. The next prime is 18981493. The reversal of 18981480 is 8418981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49369 + ... + 49751.

It is an arithmetic number, because the mean of its divisors is an integer number (518400).

Almost surely, 2^18981480 is an apocalyptic number.

18981480 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 18981480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33177600).

18981480 is an abundant number, since it is smaller than the sum of its proper divisors (47373720).

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

18981480 is a wasteful number, since it uses less digits than its factorization.

18981480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18981480 is about 4356.7740359124. The cubic root of 18981480 is about 266.7534370406.

The spelling of 18981480 in words is "eighteen million, nine hundred eighty-one thousand, four hundred eighty".