804390 has 16 divisors (see below), whose sum is σ = 1930608. Its totient is φ = 214496.

The previous prime is 804383. The next prime is 804409. The reversal of 804390 is 93408.

It is a self number, because there is not a number n which added to its sum of digits gives 804390.

It is a congruent number.

It is an unprimeable number.

804390 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 7 ways as a sum of consecutive naturals, for example, 13377 + ... + 13436.

It is an arithmetic number, because the mean of its divisors is an integer number (120663).

2⁸⁰⁴³⁹⁰ is an apocalyptic number.

804390 is an abundant number, since it is smaller than the sum of its proper divisors (1126218).

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

804390 is a wasteful number, since it uses less digits than its factorization.

804390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26823.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 804390 is about 896.8779181137. The cubic root of 804390 is about 93.0012718059.

Adding to 804390 its reverse (93408), we get a palindrome (897798).

The spelling of 804390 in words is "eight hundred four thousand, three hundred ninety".