18403968 has 64 divisors (see below), whose sum is σ = 53341920. Its totient is φ = 5575680.

The previous prime is 18403963. The next prime is 18403969. The reversal of 18403968 is 86930481.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (18403963) 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, 2046 + ... + 6402.

Almost surely, 2^18403968 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 18403968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26670960).

18403968 is an abundant number, since it is smaller than the sum of its proper divisors (34937952).

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

18403968 is a wasteful number, since it uses less digits than its factorization.

18403968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385 (or 4373 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18403968 is about 4289.9846153570. The cubic root of 18403968 is about 264.0202004745.

The spelling of 18403968 in words is "eighteen million, four hundred three thousand, nine hundred sixty-eight".