7991743 has 2 divisors, whose sum is σ = 7991744. Its totient is φ = 7991742.

The previous prime is 7991713. The next prime is 7991747. The reversal of 7991743 is 3471997.

It is a strong prime.

It is an emirp because it is prime and its reverse (3471997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7991743 - 2⁹ = 7991231 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7991696 and 7991705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7991747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995871 + 3995872.

It is an arithmetic number, because the mean of its divisors is an integer number (3995872).

Almost surely, 2^7991743 is an apocalyptic number.

7991743 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991743 is an equidigital number, since it uses as much as digits as its factorization.

7991743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 40.

The square root of 7991743 is about 2826.9671027446. The cubic root of 7991743 is about 199.9311679801.

The spelling of 7991743 in words is "seven million, nine hundred ninety-one thousand, seven hundred forty-three".