39984689 has 2 divisors, whose sum is σ = 39984690. Its totient is φ = 39984688.

The previous prime is 39984677. The next prime is 39984691. The reversal of 39984689 is 98648993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31528225 + 8456464 = 5615^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 39984689 - 2⁸ = 39984433 is a prime.

Together with 39984691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39954689) 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, 19992344 + 19992345.

It is an arithmetic number, because the mean of its divisors is an integer number (19992345).

Almost surely, 2^39984689 is an apocalyptic number.

It is an amenable number.

39984689 is a deficient number, since it is larger than the sum of its proper divisors (1).

39984689 is an equidigital number, since it uses as much as digits as its factorization.

39984689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 56.

The square root of 39984689 is about 6323.3447636516. The cubic root of 39984689 is about 341.9515480304.

The spelling of 39984689 in words is "thirty-nine million, nine hundred eighty-four thousand, six hundred eighty-nine".