18957984 has 24 divisors (see below), whose sum is σ = 49764960. Its totient is φ = 6319296.

The previous prime is 18957973. The next prime is 18957989. The reversal of 18957984 is 48975981.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18957989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98644 + ... + 98835.

It is an arithmetic number, because the mean of its divisors is an integer number (2073540).

Almost surely, 2^18957984 is an apocalyptic number.

It is an amenable number.

18957984 is an abundant number, since it is smaller than the sum of its proper divisors (30806976).

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

18957984 is a wasteful number, since it uses less digits than its factorization.

18957984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197492 (or 197484 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 18957984 is about 4354.0767103945. The cubic root of 18957984 is about 266.6433257348.

The spelling of 18957984 in words is "eighteen million, nine hundred fifty-seven thousand, nine hundred eighty-four".