804890 has 8 divisors (see below), whose sum is σ = 1448820. Its totient is φ = 321952.

The previous prime is 804889. The next prime is 804893. The reversal of 804890 is 98408.

It can be written as a sum of positive squares in 2 ways, for example, as 755161 + 49729 = 869^2 + 223^2 .

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

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (804893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40235 + ... + 40254.

2⁸⁰⁴⁸⁹⁰ is an apocalyptic number.

804890 is a deficient number, since it is larger than the sum of its proper divisors (643930).

804890 is a wasteful number, since it uses less digits than its factorization.

804890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80496.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 804890 is about 897.1566195487. The cubic root of 804890 is about 93.0205373382.

The spelling of 804890 in words is "eight hundred four thousand, eight hundred ninety".