7899967 has 2 divisors, whose sum is σ = 7899968. Its totient is φ = 7899966.

The previous prime is 7899949. The next prime is 7899979. The reversal of 7899967 is 7699987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7899967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7899467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949983 + 3949984.

It is an arithmetic number, because the mean of its divisors is an integer number (3949984).

Almost surely, 2^7899967 is an apocalyptic number.

7899967 is a deficient number, since it is larger than the sum of its proper divisors (1).

7899967 is an equidigital number, since it uses as much as digits as its factorization.

7899967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 55.

The square root of 7899967 is about 2810.6879940684. The cubic root of 7899967 is about 199.1628928128.

The spelling of 7899967 in words is "seven million, eight hundred ninety-nine thousand, nine hundred sixty-seven".