39985723 has 2 divisors, whose sum is σ = 39985724. Its totient is φ = 39985722.

The previous prime is 39985721. The next prime is 39985763. The reversal of 39985723 is 32758993.

It is a weak prime.

It is an emirp because it is prime and its reverse (32758993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39985723 - 2¹ = 39985721 is a prime.

Together with 39985721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39985721) 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, 19992861 + 19992862.

It is an arithmetic number, because the mean of its divisors is an integer number (19992862).

Almost surely, 2^39985723 is an apocalyptic number.

39985723 is a deficient number, since it is larger than the sum of its proper divisors (1).

39985723 is an equidigital number, since it uses as much as digits as its factorization.

39985723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 39985723 is about 6323.4265236500. The cubic root of 39985723 is about 341.9544956158.

The spelling of 39985723 in words is "thirty-nine million, nine hundred eighty-five thousand, seven hundred twenty-three".