39964643 has 2 divisors, whose sum is σ = 39964644. Its totient is φ = 39964642.

The previous prime is 39964633. The next prime is 39964747. The reversal of 39964643 is 34646993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39964643 - 2⁶ = 39964579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39964594 and 39964603.

It is not a weakly prime, because it can be changed into another prime (39964633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19982321 + 19982322.

It is an arithmetic number, because the mean of its divisors is an integer number (19982322).

Almost surely, 2^39964643 is an apocalyptic number.

39964643 is a deficient number, since it is larger than the sum of its proper divisors (1).

39964643 is an equidigital number, since it uses as much as digits as its factorization.

39964643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 44.

The square root of 39964643 is about 6321.7594860925. The cubic root of 39964643 is about 341.8943935983.

The spelling of 39964643 in words is "thirty-nine million, nine hundred sixty-four thousand, six hundred forty-three".