904381840 has 20 divisors (see below), whose sum is σ = 2102687964. Its totient is φ = 361752704.

The previous prime is 904381823. The next prime is 904381843. The reversal of 904381840 is 48183409.

It can be written as a sum of positive squares in 2 ways, for example, as 176677264 + 727704576 = 13292^2 + 26976^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 904381840.

It is not an unprimeable number, because it can be changed into a prime (904381843) 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, 5652307 + ... + 5652466.

Almost surely, 2^904381840 is an apocalyptic number.

It is an amenable number.

904381840 is an abundant number, since it is smaller than the sum of its proper divisors (1198306124).

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

904381840 is a wasteful number, since it uses less digits than its factorization.

904381840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11304786 (or 11304780 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 904381840 is about 30072.9419910989. The cubic root of 904381840 is about 967.0537448379.

The spelling of 904381840 in words is "nine hundred four million, three hundred eighty-one thousand, eight hundred forty".