7979819 has 2 divisors, whose sum is σ = 7979820. Its totient is φ = 7979818.

The previous prime is 7979813. The next prime is 7979821. The reversal of 7979819 is 9189797.

It is a strong prime.

It is an emirp because it is prime and its reverse (9189797) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7979819 is a prime.

It is a super-2 number, since 2×7979819² = 127355022545522, which contains 22 as substring.

Together with 7979821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7979813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989909 + 3989910.

It is an arithmetic number, because the mean of its divisors is an integer number (3989910).

Almost surely, 2^7979819 is an apocalyptic number.

7979819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979819 is an equidigital number, since it uses as much as digits as its factorization.

7979819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 50.

The square root of 7979819 is about 2824.8573415307. The cubic root of 7979819 is about 199.8316833873.

The spelling of 7979819 in words is "seven million, nine hundred seventy-nine thousand, eight hundred nineteen".