942809 has 12 divisors (see below), whose sum is σ = 1116288. Its totient is φ = 793800.

The previous prime is 942787. The next prime is 942811. The reversal of 942809 is 908249.

It is not a de Polignac number, because 942809 - 2¹² = 938713 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 942809.

It is not an unprimeable number, because it can be changed into a prime (942859) 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 11 ways as a sum of consecutive naturals, for example, 3344 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (93024).

2⁹⁴²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

942809 is a deficient number, since it is larger than the sum of its proper divisors (173479).

942809 is a wasteful number, since it uses less digits than its factorization.

942809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 349 counting only the distinct ones).

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

The square root of 942809 is about 970.9835220023. The cubic root of 942809 is about 98.0560903395.

Adding to 942809 its sum of digits (32), we get a square (942841 = 971²).

The spelling of 942809 in words is "nine hundred forty-two thousand, eight hundred nine".