7990999 has 2 divisors, whose sum is σ = 7991000. Its totient is φ = 7990998.

The previous prime is 7990993. The next prime is 7991017. The reversal of 7990999 is 9990997.

It is a weak prime.

It is an emirp because it is prime and its reverse (9990997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7990999 - 2¹⁵ = 7958231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7990993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995499 + 3995500.

It is an arithmetic number, because the mean of its divisors is an integer number (3995500).

Almost surely, 2^7990999 is an apocalyptic number.

7990999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7990999 is an equidigital number, since it uses as much as digits as its factorization.

7990999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 413343, while the sum is 52.

The square root of 7990999 is about 2826.8355098944. The cubic root of 7990999 is about 199.9249635178.

It can be divided in two parts, 79909 and 99, that added together give a palindrome (80008).

The spelling of 7990999 in words is "seven million, nine hundred ninety thousand, nine hundred ninety-nine".