39929 has 2 divisors, whose sum is σ = 39930. Its totient is φ = 39928.

The previous prime is 39901. The next prime is 39937. The reversal of 39929 is 92993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29929 + 10000 = 173^2 + 100^2 .

It is an emirp because it is prime and its reverse (92993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39929 is a prime.

It is a Chen prime.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 39895 and 39904.

It is not a weakly prime, because it can be changed into another prime (39979) 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, 19964 + 19965.

It is an arithmetic number, because the mean of its divisors is an integer number (19965).

2³⁹⁹²⁹ is an apocalyptic number.

It is an amenable number.

39929 is a deficient number, since it is larger than the sum of its proper divisors (1).

39929 is an equidigital number, since it uses as much as digits as its factorization.

39929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 32.

The square root of 39929 is about 199.8224211644. The cubic root of 39929 is about 34.1792722341.

The spelling of 39929 in words is "thirty-nine thousand, nine hundred twenty-nine".