7971679 has 2 divisors, whose sum is σ = 7971680. Its totient is φ = 7971678.

The previous prime is 7971643. The next prime is 7971683. The reversal of 7971679 is 9761797.

It is a strong prime.

It is an emirp because it is prime and its reverse (9761797) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7971679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7977679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985839 + 3985840.

It is an arithmetic number, because the mean of its divisors is an integer number (3985840).

Almost surely, 2^7971679 is an apocalyptic number.

7971679 is a deficient number, since it is larger than the sum of its proper divisors (1).

7971679 is an equidigital number, since it uses as much as digits as its factorization.

7971679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 166698, while the sum is 46.

The square root of 7971679 is about 2823.4161931958. The cubic root of 7971679 is about 199.7637126180.

The spelling of 7971679 in words is "seven million, nine hundred seventy-one thousand, six hundred seventy-nine".