39992129 has 2 divisors, whose sum is σ = 39992130. Its totient is φ = 39992128.

The previous prime is 39992111. The next prime is 39992221. The reversal of 39992129 is 92129993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 49729 = 6320^2 + 223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39992129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39992129.

It is not a weakly prime, because it can be changed into another prime (39991129) 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, 19996064 + 19996065.

It is an arithmetic number, because the mean of its divisors is an integer number (19996065).

Almost surely, 2^39992129 is an apocalyptic number.

It is an amenable number.

39992129 is a deficient number, since it is larger than the sum of its proper divisors (1).

39992129 is an equidigital number, since it uses as much as digits as its factorization.

39992129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 44.

The square root of 39992129 is about 6323.9330325360. The cubic root of 39992129 is about 341.9727558294.

The spelling of 39992129 in words is "thirty-nine million, nine hundred ninety-two thousand, one hundred twenty-nine".