39989009 has 2 divisors, whose sum is σ = 39989010. Its totient is φ = 39989008.

The previous prime is 39988951. The next prime is 39989023. The reversal of 39989009 is 90098993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32547025 + 7441984 = 5705^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 39989009 - 2¹⁶ = 39923473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39949009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994504 + 19994505.

It is an arithmetic number, because the mean of its divisors is an integer number (19994505).

Almost surely, 2^39989009 is an apocalyptic number.

It is an amenable number.

39989009 is a deficient number, since it is larger than the sum of its proper divisors (1).

39989009 is an equidigital number, since it uses as much as digits as its factorization.

39989009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 39989009 is about 6323.6863457955. The cubic root of 39989009 is about 341.9638625565.

The spelling of 39989009 in words is "thirty-nine million, nine hundred eighty-nine thousand, nine".