904840 has 16 divisors (see below), whose sum is σ = 2035980. Its totient is φ = 361920.

The previous prime is 904823. The next prime is 904847. The reversal of 904840 is 48409.

904840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 850084 + 54756 = 922^2 + 234^2 .

It is not an unprimeable number, because it can be changed into a prime (904847) by changing a digit.

904840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11271 + ... + 11350.

2⁹⁰⁴⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

904840 is an abundant number, since it is smaller than the sum of its proper divisors (1131140).

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

904840 is a wasteful number, since it uses less digits than its factorization.

904840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22632 (or 22628 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 904840 is about 951.2307816718. The cubic root of 904840 is about 96.7217020469.

It can be divided in two parts, 90 and 4840, that multiplied together give a square (435600 = 660²).

The spelling of 904840 in words is "nine hundred four thousand, eight hundred forty".