18980864 has 56 divisors (see below), whose sum is σ = 43513248. Its totient is φ = 8110080.

The previous prime is 18980839. The next prime is 18980869. The reversal of 18980864 is 46808981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57179 + ... + 57509.

Almost surely, 2^18980864 is an apocalyptic number.

18980864 is a gapful number since it is divisible by the number (14) 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 18980864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21756624).

18980864 is an abundant number, since it is smaller than the sum of its proper divisors (24532384).

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

18980864 is an frugal number, since it uses more digits than its factorization.

18980864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18980864 is about 4356.7033408301. The cubic root of 18980864 is about 266.7505513876.

The spelling of 18980864 in words is "eighteen million, nine hundred eighty thousand, eight hundred sixty-four".