7866643 has 2 divisors, whose sum is σ = 7866644. Its totient is φ = 7866642.

The previous prime is 7866637. The next prime is 7866659. The reversal of 7866643 is 3466687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7866643 - 2⁵ = 7866611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7866596 and 7866605.

It is not a weakly prime, because it can be changed into another prime (7866673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3933321 + 3933322.

It is an arithmetic number, because the mean of its divisors is an integer number (3933322).

Almost surely, 2^7866643 is an apocalyptic number.

7866643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7866643 is an equidigital number, since it uses as much as digits as its factorization.

7866643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 7866643 is about 2804.7536433705. The cubic root of 7866643 is about 198.8824588059.

The spelling of 7866643 in words is "seven million, eight hundred sixty-six thousand, six hundred forty-three".