804090906 has 48 divisors (see below), whose sum is σ = 1842079200. Its totient is φ = 252789984.

The previous prime is 804090901. The next prime is 804090913. The reversal of 804090906 is 609090408.

It is a super-2 number, since 2×804090906² = 1293124370223801672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (804090901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73185 + ... + 83451.

It is an arithmetic number, because the mean of its divisors is an integer number (38376650).

Almost surely, 2^804090906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 804090906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921039600).

804090906 is an abundant number, since it is smaller than the sum of its proper divisors (1037988294).

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

804090906 is a wasteful number, since it uses less digits than its factorization.

804090906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523 (or 10520 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 804090906 is about 28356.4967159203. The cubic root of 804090906 is about 929.8974357929.

The spelling of 804090906 in words is "eight hundred four million, ninety thousand, nine hundred six".