804989 has 2 divisors, whose sum is σ = 804990. Its totient is φ = 804988.

The previous prime is 804983. The next prime is 804997. The reversal of 804989 is 989408.

804989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 293764 = 715^2 + 542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-804989 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402494 + 402495.

It is an arithmetic number, because the mean of its divisors is an integer number (402495).

2⁸⁰⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

804989 is a deficient number, since it is larger than the sum of its proper divisors (1).

804989 is an equidigital number, since it uses as much as digits as its factorization.

804989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 804989 is about 897.2117921650. The cubic root of 804989 is about 93.0243509672.

The spelling of 804989 in words is "eight hundred four thousand, nine hundred eighty-nine".