7996991 has 4 divisors (see below), whose sum is σ = 8010072. Its totient is φ = 7983912.

The previous prime is 7996981. The next prime is 7996993. The reversal of 7996991 is 1996997.

7996991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1996997 = 577 ⋅3461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7996991 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 (7996993) 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 in 3 ways as a sum of consecutive naturals, for example, 5576 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (2002518).

Almost surely, 2^7996991 is an apocalyptic number.

7996991 is a deficient number, since it is larger than the sum of its proper divisors (13081).

7996991 is a wasteful number, since it uses less digits than its factorization.

7996991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080.

The product of its digits is 275562, while the sum is 50.

The square root of 7996991 is about 2827.8951536434. The cubic root of 7996991 is about 199.9749218556.

The spelling of 7996991 in words is "seven million, nine hundred ninety-six thousand, nine hundred ninety-one".