422809 has 8 divisors (see below), whose sum is σ = 456192. Its totient is φ = 390720.

The previous prime is 422803. The next prime is 422827. The reversal of 422809 is 908224.

422809 = T₄₅ + T₄₆ + ... + T₁₃₇.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (422803) 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 7 ways as a sum of consecutive naturals, for example, 417 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (57024).

2⁴²²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

422809 is a deficient number, since it is larger than the sum of its proper divisors (33383).

422809 is a wasteful number, since it uses less digits than its factorization.

422809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 422809 is about 650.2376488639. The cubic root of 422809 is about 75.0553073527.

The spelling of 422809 in words is "four hundred twenty-two thousand, eight hundred nine".