18984720 has 40 divisors (see below), whose sum is σ = 58853376. Its totient is φ = 5062528.

The previous prime is 18984709. The next prime is 18984731. The reversal of 18984720 is 2748981.

It is an interprime number because it is at equal distance from previous prime (18984709) and next prime (18984731).

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39312 + ... + 39791.

Almost surely, 2^18984720 is an apocalyptic number.

18984720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18984720 is an abundant number, since it is smaller than the sum of its proper divisors (39868656).

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

18984720 is a wasteful number, since it uses less digits than its factorization.

18984720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79119 (or 79113 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18984720 is about 4357.1458547999. The cubic root of 18984720 is about 266.7686137982.

The spelling of 18984720 in words is "eighteen million, nine hundred eighty-four thousand, seven hundred twenty".