809042 has 24 divisors (see below), whose sum is σ = 1390116. Its totient is φ = 350784.

The previous prime is 809041. The next prime is 809051. The reversal of 809042 is 240908.

It can be written as a sum of positive squares in 6 ways, for example, as 450241 + 358801 = 671^2 + 599^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 808999 and 809017.

It is not an unprimeable number, because it can be changed into a prime (809041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21848 + ... + 21884.

2⁸⁰⁹⁰⁴² is an apocalyptic number.

809042 is a deficient number, since it is larger than the sum of its proper divisors (581074).

809042 is a wasteful number, since it uses less digits than its factorization.

809042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 809042 is about 899.4676203177. The cubic root of 809042 is about 93.1802109434.

The spelling of 809042 in words is "eight hundred nine thousand, forty-two".