9940643 has 2 divisors, whose sum is σ = 9940644. Its totient is φ = 9940642.

The previous prime is 9940613. The next prime is 9940681. The reversal of 9940643 is 3460499.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9940643 - 2⁸ = 9940387 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9940603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4970321 + 4970322.

It is an arithmetic number, because the mean of its divisors is an integer number (4970322).

Almost surely, 2^9940643 is an apocalyptic number.

9940643 is a deficient number, since it is larger than the sum of its proper divisors (1).

9940643 is an equidigital number, since it uses as much as digits as its factorization.

9940643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 9940643 is about 3152.8785260457. The cubic root of 9940643 is about 215.0163535424.

The spelling of 9940643 in words is "nine million, nine hundred forty thousand, six hundred forty-three".