7996981 has 2 divisors, whose sum is σ = 7996982. Its totient is φ = 7996980.

The previous prime is 7996973. The next prime is 7996993. The reversal of 7996981 is 1896997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5716881 + 2280100 = 2391^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 7996981 - 2³ = 7996973 is a prime.

It is a super-2 number, since 2×7996981² = 127903410228722, which contains 22 as substring.

7996981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7996951) 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, 3998490 + 3998491.

It is an arithmetic number, because the mean of its divisors is an integer number (3998491).

Almost surely, 2^7996981 is an apocalyptic number.

It is an amenable number.

7996981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7996981 is an equidigital number, since it uses as much as digits as its factorization.

7996981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7996981 is about 2827.8933855434. The cubic root of 7996981 is about 199.9748385013.

The spelling of 7996981 in words is "seven million, nine hundred ninety-six thousand, nine hundred eighty-one".