809994239 has 4 divisors (see below), whose sum is σ = 813005640. Its totient is φ = 806982840.

The previous prime is 809994217. The next prime is 809994253. The reversal of 809994239 is 932499908.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 809994239 - 2¹⁶ = 809928703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809994739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505297 + ... + 1505834.

It is an arithmetic number, because the mean of its divisors is an integer number (203251410).

Almost surely, 2^809994239 is an apocalyptic number.

809994239 is a deficient number, since it is larger than the sum of its proper divisors (3011401).

809994239 is a wasteful number, since it uses less digits than its factorization.

809994239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011400.

The product of its (nonzero) digits is 1259712, while the sum is 53.

The square root of 809994239 is about 28460.3977308821. The cubic root of 809994239 is about 932.1675418097.

The spelling of 809994239 in words is "eight hundred nine million, nine hundred ninety-four thousand, two hundred thirty-nine".