18328446 has 12 divisors (see below), whose sum is σ = 39711672. Its totient is φ = 6109476.

The previous prime is 18328439. The next prime is 18328451. The reversal of 18328446 is 64482381.

It is a self number, because there is not a number n which added to its sum of digits gives 18328446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 509106 + ... + 509141.

It is an arithmetic number, because the mean of its divisors is an integer number (3309306).

Almost surely, 2^18328446 is an apocalyptic number.

18328446 is an abundant number, since it is smaller than the sum of its proper divisors (21383226).

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

18328446 is a wasteful number, since it uses less digits than its factorization.

18328446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018255 (or 1018252 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 18328446 is about 4281.1734372716. The cubic root of 18328446 is about 263.6585634244.

The spelling of 18328446 in words is "eighteen million, three hundred twenty-eight thousand, four hundred forty-six".