18400448 has 56 divisors (see below), whose sum is σ = 40599360. Its totient is φ = 8203520.

The previous prime is 18400441. The next prime is 18400451. The reversal of 18400448 is 84400481.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18400448.

It is not an unprimeable number, because it can be changed into a prime (18400441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41315 + ... + 41757.

Almost surely, 2^18400448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18400448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20299680).

18400448 is an abundant number, since it is smaller than the sum of its proper divisors (22198912).

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

18400448 is a wasteful number, since it uses less digits than its factorization.

18400448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 18400448 is about 4289.5743378568. The cubic root of 18400448 is about 264.0033669604.

The spelling of 18400448 in words is "eighteen million, four hundred thousand, four hundred forty-eight".