904390 has 8 divisors (see below), whose sum is σ = 1627920. Its totient is φ = 361752.

The previous prime is 904369. The next prime is 904399. The reversal of 904390 is 93409.

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

It is an Ulam number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (904399) by changing a digit.

904390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 45210 + ... + 45229.

It is an arithmetic number, because the mean of its divisors is an integer number (203490).

2⁹⁰⁴³⁹⁰ is an apocalyptic number.

904390 is a deficient number, since it is larger than the sum of its proper divisors (723530).

904390 is a wasteful number, since it uses less digits than its factorization.

904390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90446.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 904390 is about 950.9942165965. The cubic root of 904390 is about 96.7056653320.

Adding to 904390 its reverse (93409), we get a palindrome (997799).

The spelling of 904390 in words is "nine hundred four thousand, three hundred ninety".