39960509 has 2 divisors, whose sum is σ = 39960510. Its totient is φ = 39960508.

The previous prime is 39960493. The next prime is 39960511. The reversal of 39960509 is 90506993.

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., 26491609 + 13468900 = 5147^2 + 3670^2 .

It is an emirp because it is prime and its reverse (90506993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39960509 - 2⁴ = 39960493 is a prime.

Together with 39960511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39960539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19980254 + 19980255.

It is an arithmetic number, because the mean of its divisors is an integer number (19980255).

Almost surely, 2^39960509 is an apocalyptic number.

It is an amenable number.

39960509 is a deficient number, since it is larger than the sum of its proper divisors (1).

39960509 is an equidigital number, since it uses as much as digits as its factorization.

39960509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 39960509 is about 6321.4325117018. The cubic root of 39960509 is about 341.8826045096.

The spelling of 39960509 in words is "thirty-nine million, nine hundred sixty thousand, five hundred nine".