806239979 has 4 divisors (see below), whose sum is σ = 806595720. Its totient is φ = 805884240.

The previous prime is 806239969. The next prime is 806240047. The reversal of 806239979 is 979932608.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806239979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 806239979.

It is not an unprimeable number, because it can be changed into a prime (806239969) 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, 174449 + ... + 179010.

It is an arithmetic number, because the mean of its divisors is an integer number (201648930).

Almost surely, 2^806239979 is an apocalyptic number.

806239979 is a deficient number, since it is larger than the sum of its proper divisors (355741).

806239979 is a wasteful number, since it uses less digits than its factorization.

806239979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355740.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 806239979 is about 28394.3652684824. The cubic root of 806239979 is about 930.7251364600.

The spelling of 806239979 in words is "eight hundred six million, two hundred thirty-nine thousand, nine hundred seventy-nine".