39244935721 has 2 divisors, whose sum is σ = 39244935722. Its totient is φ = 39244935720.

The previous prime is 39244935671. The next prime is 39244935809. The reversal of 39244935721 is 12753944293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21064458496 + 18180477225 = 145136^2 + 134835^2 .

It is an emirp because it is prime and its reverse (12753944293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39244935721 - 2⁹ = 39244935209 is a prime.

It is not a weakly prime, because it can be changed into another prime (39244435721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19622467860 + 19622467861.

It is an arithmetic number, because the mean of its divisors is an integer number (19622467861).

Almost surely, 2^39244935721 is an apocalyptic number.

It is an amenable number.

39244935721 is a deficient number, since it is larger than the sum of its proper divisors (1).

39244935721 is an equidigital number, since it uses as much as digits as its factorization.

39244935721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 49.

The spelling of 39244935721 in words is "thirty-nine billion, two hundred forty-four million, nine hundred thirty-five thousand, seven hundred twenty-one".