8199979 has 2 divisors, whose sum is σ = 8199980. Its totient is φ = 8199978.

The previous prime is 8199943. The next prime is 8200007. The reversal of 8199979 is 9799918.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8199979 is a prime.

8199979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8199179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099989 + 4099990.

It is an arithmetic number, because the mean of its divisors is an integer number (4099990).

Almost surely, 2^8199979 is an apocalyptic number.

8199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

8199979 is an equidigital number, since it uses as much as digits as its factorization.

8199979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 52.

The square root of 8199979 is about 2863.5605458939. The cubic root of 8199979 is about 201.6527953789.

The spelling of 8199979 in words is "eight million, one hundred ninety-nine thousand, nine hundred seventy-nine".