163243904 has 32 divisors (see below), whose sum is σ = 326279640. Its totient is φ = 81354240.

The previous prime is 163243901. The next prime is 163243909. The reversal of 163243904 is 409342361.

163243904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×163243904² = 53297144386322432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163243901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40442 + ... + 44294.

Almost surely, 2^163243904 is an apocalyptic number.

It is an amenable number.

163243904 is a deficient number, since it is larger than the sum of its proper divisors (163035736).

163243904 is an equidigital number, since it uses as much as digits as its factorization.

163243904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 163243904 is about 12776.6937820392. The cubic root of 163243904 is about 546.5278833368.

The spelling of 163243904 in words is "one hundred sixty-three million, two hundred forty-three thousand, nine hundred four".