8091904 has 36 divisors (see below), whose sum is σ = 16411276. Its totient is φ = 3981312.

The previous prime is 8091901. The next prime is 8091907. The reversal of 8091904 is 4091908.

It is an interprime number because it is at equal distance from previous prime (8091901) and next prime (8091907).

It can be written as a sum of positive squares in 2 ways, for example, as 2560000 + 5531904 = 1600^2 + 2352^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8091901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18472 + ... + 18904.

Almost surely, 2^8091904 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 8091904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8205638).

8091904 is an abundant number, since it is smaller than the sum of its proper divisors (8319372).

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

8091904 is an equidigital number, since it uses as much as digits as its factorization.

8091904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8091904 is about 2844.6272163501. The cubic root of 8091904 is about 200.7629524833.

The spelling of 8091904 in words is "eight million, ninety-one thousand, nine hundred four".