129439637 has 2 divisors, whose sum is σ = 129439638. Its totient is φ = 129439636.

The previous prime is 129439631. The next prime is 129439657. The reversal of 129439637 is 736934921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106791556 + 22648081 = 10334^2 + 4759^2 .

It is a cyclic number.

It is not a de Polignac number, because 129439637 - 2⁶ = 129439573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129439631) 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, 64719818 + 64719819.

It is an arithmetic number, because the mean of its divisors is an integer number (64719819).

Almost surely, 2^129439637 is an apocalyptic number.

It is an amenable number.

129439637 is a deficient number, since it is larger than the sum of its proper divisors (1).

129439637 is an equidigital number, since it uses as much as digits as its factorization.

129439637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 129439637 is about 11377.1541696507. The cubic root of 129439637 is about 505.8507855733.

The spelling of 129439637 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, six hundred thirty-seven".