18398304 has 72 divisors (see below), whose sum is σ = 52750152. Its totient is φ = 6082560.

The previous prime is 18398279. The next prime is 18398309. The reversal of 18398304 is 40389381.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55419 + ... + 55749.

It is an arithmetic number, because the mean of its divisors is an integer number (732641).

Almost surely, 2^18398304 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 18398304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26375076).

18398304 is an abundant number, since it is smaller than the sum of its proper divisors (34351848).

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

18398304 is a wasteful number, since it uses less digits than its factorization.

18398304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18398304 is about 4289.3244223304. The cubic root of 18398304 is about 263.9931127680.

The spelling of 18398304 in words is "eighteen million, three hundred ninety-eight thousand, three hundred four".