813985339 has 4 divisors (see below), whose sum is σ = 831304224. Its totient is φ = 796666456.

The previous prime is 813985303. The next prime is 813985343. The reversal of 813985339 is 933589318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 933589318 = 2 ⋅466794659.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813985339 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813985292 and 813985301.

It is not an unprimeable number, because it can be changed into a prime (813985349) 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, 8659372 + ... + 8659465.

It is an arithmetic number, because the mean of its divisors is an integer number (207826056).

Almost surely, 2^813985339 is an apocalyptic number.

813985339 is a deficient number, since it is larger than the sum of its proper divisors (17318885).

813985339 is a wasteful number, since it uses less digits than its factorization.

813985339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17318884.

The product of its digits is 699840, while the sum is 49.

The square root of 813985339 is about 28530.4283003253. The cubic root of 813985339 is about 933.6960629933.

The spelling of 813985339 in words is "eight hundred thirteen million, nine hundred eighty-five thousand, three hundred thirty-nine".