7999913 has 2 divisors, whose sum is σ = 7999914. Its totient is φ = 7999912.

The previous prime is 7999909. The next prime is 7999919. The reversal of 7999913 is 3199997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7573504 + 426409 = 2752^2 + 653^2 .

It is an emirp because it is prime and its reverse (3199997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7999913 - 2² = 7999909 is a prime.

It is not a weakly prime, because it can be changed into another prime (7999919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999956 + 3999957.

It is an arithmetic number, because the mean of its divisors is an integer number (3999957).

Almost surely, 2^7999913 is an apocalyptic number.

It is an amenable number.

7999913 is a deficient number, since it is larger than the sum of its proper divisors (1).

7999913 is an equidigital number, since it uses as much as digits as its factorization.

7999913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 47.

The square root of 7999913 is about 2828.4117451319. The cubic root of 7999913 is about 199.9992749974. Note that the first 3 decimals are identical.

The spelling of 7999913 in words is "seven million, nine hundred ninety-nine thousand, nine hundred thirteen".