904405 has 8 divisors (see below), whose sum is σ = 1090872. Its totient is φ = 719808.

The previous prime is 904399. The next prime is 904441. The reversal of 904405 is 504409.

It can be written as a sum of positive squares in 4 ways, for example, as 4 + 904401 = 2^2 + 951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 904405 - 2¹¹ = 902357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1059 + ... + 1711.

It is an arithmetic number, because the mean of its divisors is an integer number (136359).

2⁹⁰⁴⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

904405 is a deficient number, since it is larger than the sum of its proper divisors (186467).

904405 is a wasteful number, since it uses less digits than its factorization.

904405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 904405 is about 951.0021030471. The cubic root of 904405 is about 96.7061999748.

The spelling of 904405 in words is "nine hundred four thousand, four hundred five".