9840643 has 2 divisors, whose sum is σ = 9840644. Its totient is φ = 9840642.

The previous prime is 9840617. The next prime is 9840647. The reversal of 9840643 is 3460489.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9840643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9840599 and 9840608.

It is not a weakly prime, because it can be changed into another prime (9840647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4920321 + 4920322.

It is an arithmetic number, because the mean of its divisors is an integer number (4920322).

Almost surely, 2^9840643 is an apocalyptic number.

9840643 is a deficient number, since it is larger than the sum of its proper divisors (1).

9840643 is an equidigital number, since it uses as much as digits as its factorization.

9840643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 9840643 is about 3136.9799170540. The cubic root of 9840643 is about 214.2929214296.

The spelling of 9840643 in words is "nine million, eight hundred forty thousand, six hundred forty-three".