804399 has 4 divisors (see below), whose sum is σ = 1072536. Its totient is φ = 536264.

The previous prime is 804383. The next prime is 804409. The reversal of 804399 is 993408.

804399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 804399 - 2⁴ = 804383 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134064 + ... + 134069.

It is an arithmetic number, because the mean of its divisors is an integer number (268134).

2⁸⁰⁴³⁹⁹ is an apocalyptic number.

804399 is a deficient number, since it is larger than the sum of its proper divisors (268137).

804399 is a wasteful number, since it uses less digits than its factorization.

804399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268136.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 804399 is about 896.8829355050. The cubic root of 804399 is about 93.0016186561.

Adding to 804399 its product of nonzero digits (7776), we get a triangular number (812175 = T₁₂₇₄).

The spelling of 804399 in words is "eight hundred four thousand, three hundred ninety-nine".