793985809 has 4 divisors (see below), whose sum is σ = 821364660. Its totient is φ = 766606960.

The previous prime is 793985771. The next prime is 793985831. The reversal of 793985809 is 908589397.

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

It can be written as a sum of positive squares in 2 ways, for example, as 667085584 + 126900225 = 25828^2 + 11265^2 .

It is a cyclic number.

It is not a de Polignac number, because 793985809 - 2⁷ = 793985681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (793985879) 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, 13689382 + ... + 13689439.

It is an arithmetic number, because the mean of its divisors is an integer number (205341165).

Almost surely, 2^793985809 is an apocalyptic number.

It is an amenable number.

793985809 is a deficient number, since it is larger than the sum of its proper divisors (27378851).

793985809 is a wasteful number, since it uses less digits than its factorization.

793985809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27378850.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The square root of 793985809 is about 28177.7537962131. The cubic root of 793985809 is about 925.9856293067.

The spelling of 793985809 in words is "seven hundred ninety-three million, nine hundred eighty-five thousand, eight hundred nine".