804781 has 4 divisors (see below), whose sum is σ = 821952. Its totient is φ = 787612.

The previous prime is 804767. The next prime is 804803. The reversal of 804781 is 187408.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 804781 - 2⁷ = 804653 is a prime.

It is a super-2 number, since 2×804781² = 1295344915922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804751) by changing a digit.

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, 8515 + ... + 8608.

It is an arithmetic number, because the mean of its divisors is an integer number (205488).

2⁸⁰⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

804781 is a deficient number, since it is larger than the sum of its proper divisors (17171).

804781 is a wasteful number, since it uses less digits than its factorization.

804781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17170.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 804781 is about 897.0958700161. The cubic root of 804781 is about 93.0163381324.

It can be divided in two parts, 8047 and 81, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 804781 in words is "eight hundred four thousand, seven hundred eighty-one".