7740643 has 2 divisors, whose sum is σ = 7740644. Its totient is φ = 7740642.

The previous prime is 7740641. The next prime is 7740647. The reversal of 7740643 is 3460477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7740643 - 2¹ = 7740641 is a prime.

Together with 7740641, it forms a pair of twin primes.

7740643 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7740641) 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, 3870321 + 3870322.

It is an arithmetic number, because the mean of its divisors is an integer number (3870322).

Almost surely, 2^7740643 is an apocalyptic number.

7740643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7740643 is an equidigital number, since it uses as much as digits as its factorization.

7740643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 7740643 is about 2782.2011070374. The cubic root of 7740643 is about 197.8149054170.

The spelling of 7740643 in words is "seven million, seven hundred forty thousand, six hundred forty-three".