129645387 has 16 divisors (see below), whose sum is σ = 196535680. Its totient is φ = 84419496.

The previous prime is 129645377. The next prime is 129645391. The reversal of 129645387 is 783546921.

It is not a de Polignac number, because 129645387 - 2⁴ = 129645371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129645377) 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 in 15 ways as a sum of consecutive naturals, for example, 54673 + ... + 56994.

It is an arithmetic number, because the mean of its divisors is an integer number (12283480).

Almost surely, 2^129645387 is an apocalyptic number.

129645387 is a deficient number, since it is larger than the sum of its proper divisors (66890293).

129645387 is a wasteful number, since it uses less digits than its factorization.

129645387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111719 (or 111713 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 129645387 is about 11386.1928228886. The cubic root of 129645387 is about 506.1186677158.

The spelling of 129645387 in words is "one hundred twenty-nine million, six hundred forty-five thousand, three hundred eighty-seven".