7979813 has 2 divisors, whose sum is σ = 7979814. Its totient is φ = 7979812.

The previous prime is 7979779. The next prime is 7979819. The reversal of 7979813 is 3189797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7963684 + 16129 = 2822^2 + 127^2 .

It is a cyclic number.

It is not a de Polignac number, because 7979813 - 2¹² = 7975717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7979819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989906 + 3989907.

It is an arithmetic number, because the mean of its divisors is an integer number (3989907).

Almost surely, 2^7979813 is an apocalyptic number.

It is an amenable number.

7979813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979813 is an equidigital number, since it uses as much as digits as its factorization.

7979813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 44.

The square root of 7979813 is about 2824.8562795300. The cubic root of 7979813 is about 199.8316333030.

The spelling of 7979813 in words is "seven million, nine hundred seventy-nine thousand, eight hundred thirteen".