7974991 has 2 divisors, whose sum is σ = 7974992. Its totient is φ = 7974990.

The previous prime is 7974977. The next prime is 7975013. The reversal of 7974991 is 1994797.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7974991 - 2¹⁵ = 7942223 is a prime.

7974991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7974961) 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 as a sum of consecutive naturals, namely, 3987495 + 3987496.

It is an arithmetic number, because the mean of its divisors is an integer number (3987496).

Almost surely, 2^7974991 is an apocalyptic number.

7974991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7974991 is an equidigital number, since it uses as much as digits as its factorization.

7974991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 46.

The square root of 7974991 is about 2824.0026558061. The cubic root of 7974991 is about 199.7913741185.

The spelling of 7974991 in words is "seven million, nine hundred seventy-four thousand, nine hundred ninety-one".