39520643 has 2 divisors, whose sum is σ = 39520644. Its totient is φ = 39520642.

The previous prime is 39520633. The next prime is 39520661. The reversal of 39520643 is 34602593.

It is a weak prime.

It is an emirp because it is prime and its reverse (34602593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39520643 - 2⁸ = 39520387 is a prime.

It is not a weakly prime, because it can be changed into another prime (39520633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19760321 + 19760322.

It is an arithmetic number, because the mean of its divisors is an integer number (19760322).

Almost surely, 2^39520643 is an apocalyptic number.

39520643 is a deficient number, since it is larger than the sum of its proper divisors (1).

39520643 is an equidigital number, since it uses as much as digits as its factorization.

39520643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 39520643 is about 6286.5445993805. The cubic root of 39520643 is about 340.6235472036.

The spelling of 39520643 in words is "thirty-nine million, five hundred twenty thousand, six hundred forty-three".