7987799 has 2 divisors, whose sum is σ = 7987800. Its totient is φ = 7987798.

The previous prime is 7987781. The next prime is 7987813. The reversal of 7987799 is 9977897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7987799 - 2²⁰ = 6939223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7987729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993899 + 3993900.

It is an arithmetic number, because the mean of its divisors is an integer number (3993900).

Almost surely, 2^7987799 is an apocalyptic number.

7987799 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987799 is an equidigital number, since it uses as much as digits as its factorization.

7987799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 56.

The square root of 7987799 is about 2826.2694492918. The cubic root of 7987799 is about 199.8982732671.

It can be divided in two parts, 79 and 87799, that added together give a palindrome (87878).

The spelling of 7987799 in words is "seven million, nine hundred eighty-seven thousand, seven hundred ninety-nine".