7968991 has 4 divisors (see below), whose sum is σ = 8138592. Its totient is φ = 7799392.

The previous prime is 7968959. The next prime is 7969019. The reversal of 7968991 is 1998697.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7968991 - 2⁵ = 7968959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7968911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84730 + ... + 84823.

It is an arithmetic number, because the mean of its divisors is an integer number (2034648).

Almost surely, 2^7968991 is an apocalyptic number.

7968991 is a deficient number, since it is larger than the sum of its proper divisors (169601).

7968991 is a wasteful number, since it uses less digits than its factorization.

7968991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169600.

The product of its digits is 244944, while the sum is 49.

The square root of 7968991 is about 2822.9401339738. The cubic root of 7968991 is about 199.7412570715.

The spelling of 7968991 in words is "seven million, nine hundred sixty-eight thousand, nine hundred ninety-one".