18420384 has 48 divisors (see below), whose sum is σ = 51202368. Its totient is φ = 5778432.

The previous prime is 18420379. The next prime is 18420407. The reversal of 18420384 is 48302481.

It is a tau number, because it is divible by the number of its divisors (48).

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, 4012 + ... + 7275.

It is an arithmetic number, because the mean of its divisors is an integer number (1066716).

Almost surely, 2^18420384 is an apocalyptic number.

It is an amenable number.

18420384 is an abundant number, since it is smaller than the sum of its proper divisors (32781984).

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

18420384 is a wasteful number, since it uses less digits than its factorization.

18420384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317 (or 11309 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18420384 is about 4291.8974824662. The cubic root of 18420384 is about 264.0986775288.

The spelling of 18420384 in words is "eighteen million, four hundred twenty thousand, three hundred eighty-four".