7927891 has 2 divisors, whose sum is σ = 7927892. Its totient is φ = 7927890.

The previous prime is 7927859. The next prime is 7927919. The reversal of 7927891 is 1987297.

It is a happy number.

7927891 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 a cyclic number.

It is not a de Polignac number, because 7927891 - 2⁵ = 7927859 is a prime.

It is not a weakly prime, because it can be changed into another prime (7927811) 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, 3963945 + 3963946.

It is an arithmetic number, because the mean of its divisors is an integer number (3963946).

Almost surely, 2^7927891 is an apocalyptic number.

7927891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7927891 is an equidigital number, since it uses as much as digits as its factorization.

7927891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 7927891 is about 2815.6510792355. The cubic root of 7927891 is about 199.3972771169.

The spelling of 7927891 in words is "seven million, nine hundred twenty-seven thousand, eight hundred ninety-one".