7999919 has 2 divisors, whose sum is σ = 7999920. Its totient is φ = 7999918.

The previous prime is 7999913. The next prime is 7999921. The reversal of 7999919 is 9199997.

7999919 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (9199997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7999919 - 2¹⁶ = 7934383 is a prime.

It is a super-2 number, since 2×7999919² = 127997408013122, which contains 22 as substring.

Together with 7999921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7999913) 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, 3999959 + 3999960.

It is an arithmetic number, because the mean of its divisors is an integer number (3999960).

Almost surely, 2^7999919 is an apocalyptic number.

7999919 is a deficient number, since it is larger than the sum of its proper divisors (1).

7999919 is an equidigital number, since it uses as much as digits as its factorization.

7999919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 413343, while the sum is 53.

The square root of 7999919 is about 2828.4128057976. The cubic root of 7999919 is about 199.9993249977. Note that the first 3 decimals are identical.

The spelling of 7999919 in words is "seven million, nine hundred ninety-nine thousand, nine hundred nineteen".