7947899 has 2 divisors, whose sum is σ = 7947900. Its totient is φ = 7947898.

The previous prime is 7947869. The next prime is 7947917. The reversal of 7947899 is 9987497.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7947899 - 2²⁰ = 6899323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7947899.

It is not a weakly prime, because it can be changed into another prime (7947839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3973949 + 3973950.

It is an arithmetic number, because the mean of its divisors is an integer number (3973950).

Almost surely, 2^7947899 is an apocalyptic number.

7947899 is a deficient number, since it is larger than the sum of its proper divisors (1).

7947899 is an equidigital number, since it uses as much as digits as its factorization.

7947899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 7947899 is about 2819.2018374001. The cubic root of 7947899 is about 199.5648790352.

The spelling of 7947899 in words is "seven million, nine hundred forty-seven thousand, eight hundred ninety-nine".