39890009 has 2 divisors, whose sum is σ = 39890010. Its totient is φ = 39890008.

The previous prime is 39890003. The next prime is 39890021. The reversal of 39890009 is 90009893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36336784 + 3553225 = 6028^2 + 1885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39890009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39890003) 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, 19945004 + 19945005.

It is an arithmetic number, because the mean of its divisors is an integer number (19945005).

Almost surely, 2^39890009 is an apocalyptic number.

It is an amenable number.

39890009 is a deficient number, since it is larger than the sum of its proper divisors (1).

39890009 is an equidigital number, since it uses as much as digits as its factorization.

39890009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 39890009 is about 6315.8537823480. The cubic root of 39890009 is about 341.6814316311.

The spelling of 39890009 in words is "thirty-nine million, eight hundred ninety thousand, nine".