7999979 has 16 divisors (see below), whose sum is σ = 9307872. Its totient is φ = 6809088.

The previous prime is 7999963. The next prime is 7999993. The reversal of 7999979 is 9799997.

7999979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7999979 - 2⁴ = 7999963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999909) 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 in 15 ways as a sum of consecutive naturals, for example, 11372 + ... + 12054.

It is an arithmetic number, because the mean of its divisors is an integer number (581742).

Almost surely, 2^7999979 is an apocalyptic number.

7999979 is a deficient number, since it is larger than the sum of its proper divisors (1307893).

7999979 is a wasteful number, since it uses less digits than its factorization.

7999979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 2893401, while the sum is 59.

The square root of 7999979 is about 2828.4234124332. The cubic root of 7999979 is about 199.9998249998. Note that the first 3 decimals are identical.

The spelling of 7999979 in words is "seven million, nine hundred ninety-nine thousand, nine hundred seventy-nine".