809942 has 8 divisors (see below), whose sum is σ = 1388496. Its totient is φ = 347112.

The previous prime is 809929. The next prime is 809981. The reversal of 809942 is 249908.

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

It is a junction number, because it is equal to n+sod(n) for n = 809899 and 809908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28913 + ... + 28940.

It is an arithmetic number, because the mean of its divisors is an integer number (173562).

2⁸⁰⁹⁹⁴² is an apocalyptic number.

809942 is a deficient number, since it is larger than the sum of its proper divisors (578554).

809942 is a wasteful number, since it uses less digits than its factorization.

809942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57862.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 809942 is about 899.9677772009. The cubic root of 809942 is about 93.2147501936.

The spelling of 809942 in words is "eight hundred nine thousand, nine hundred forty-two".