7897691 has 2 divisors, whose sum is σ = 7897692. Its totient is φ = 7897690.

The previous prime is 7897667. The next prime is 7897697. The reversal of 7897691 is 1967987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7897691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7897697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3948845 + 3948846.

It is an arithmetic number, because the mean of its divisors is an integer number (3948846).

Almost surely, 2^7897691 is an apocalyptic number.

7897691 is a deficient number, since it is larger than the sum of its proper divisors (1).

7897691 is an equidigital number, since it uses as much as digits as its factorization.

7897691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 7897691 is about 2810.2830818265. The cubic root of 7897691 is about 199.1437645353.

The spelling of 7897691 in words is "seven million, eight hundred ninety-seven thousand, six hundred ninety-one".