18405648 has 30 divisors (see below), whose sum is σ = 51510654. Its totient is φ = 6135168.

The previous prime is 18405619. The next prime is 18405649. The reversal of 18405648 is 84650481.

18405648 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 5 + 648 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12873744 + 5531904 = 3588^2 + 2352^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18405649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63765 + ... + 64052.

Almost surely, 2^18405648 is an apocalyptic number.

18405648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18405648 is an abundant number, since it is smaller than the sum of its proper divisors (33105006).

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

18405648 is a wasteful number, since it uses less digits than its factorization.

18405648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127831 (or 127822 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 18405648 is about 4290.1804157867. The cubic root of 18405648 is about 264.0282338950.

The spelling of 18405648 in words is "eighteen million, four hundred five thousand, six hundred forty-eight".