8243904 has 28 divisors (see below), whose sum is σ = 21812504. Its totient is φ = 2747904.

The previous prime is 8243899. The next prime is 8243909. The reversal of 8243904 is 4093428.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8243899) and next prime (8243909).

It is a super-2 number, since 2×8243904² = 135923906322432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8243909) 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, 21277 + ... + 21660.

It is an arithmetic number, because the mean of its divisors is an integer number (779018).

Almost surely, 2^8243904 is an apocalyptic number.

It is an amenable number.

8243904 is an abundant number, since it is smaller than the sum of its proper divisors (13568600).

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

8243904 is a wasteful number, since it uses less digits than its factorization.

8243904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42952 (or 42942 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 8243904 is about 2871.2199497774. The cubic root of 8243904 is about 202.0122202848.

The spelling of 8243904 in words is "eight million, two hundred forty-three thousand, nine hundred four".