39744689 has 2 divisors, whose sum is σ = 39744690. Its totient is φ = 39744688.

The previous prime is 39744673. The next prime is 39744709. The reversal of 39744689 is 98644793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26091664 + 13653025 = 5108^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 39744689 - 2⁴ = 39744673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39744629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19872344 + 19872345.

It is an arithmetic number, because the mean of its divisors is an integer number (19872345).

Almost surely, 2^39744689 is an apocalyptic number.

It is an amenable number.

39744689 is a deficient number, since it is larger than the sum of its proper divisors (1).

39744689 is an equidigital number, since it uses as much as digits as its factorization.

39744689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 39744689 is about 6304.3389026923. The cubic root of 39744689 is about 341.2660096162.

The spelling of 39744689 in words is "thirty-nine million, seven hundred forty-four thousand, six hundred eighty-nine".