18400648 has 32 divisors (see below), whose sum is σ = 39571200. Its totient is φ = 7857792.

The previous prime is 18400637. The next prime is 18400651. The reversal of 18400648 is 84600481.

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, 25233 + ... + 25951.

It is an arithmetic number, because the mean of its divisors is an integer number (1236600).

Almost surely, 2^18400648 is an apocalyptic number.

It is an amenable number.

18400648 is an abundant number, since it is smaller than the sum of its proper divisors (21170552).

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

18400648 is a wasteful number, since it uses less digits than its factorization.

18400648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1185 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18400648 is about 4289.5976501299. The cubic root of 18400648 is about 264.0043234676.

The spelling of 18400648 in words is "eighteen million, four hundred thousand, six hundred forty-eight".