129309687 has 24 divisors (see below), whose sum is σ = 211738800. Its totient is φ = 75385728.

The previous prime is 129309683. The next prime is 129309727. The reversal of 129309687 is 786903921.

It is not a de Polignac number, because 129309687 - 2² = 129309683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129309683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26862 + ... + 31307.

It is an arithmetic number, because the mean of its divisors is an integer number (8822450).

Almost surely, 2^129309687 is an apocalyptic number.

129309687 is a deficient number, since it is larger than the sum of its proper divisors (82429113).

129309687 is a wasteful number, since it uses less digits than its factorization.

129309687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58207 (or 58204 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 129309687 is about 11371.4417291740. The cubic root of 129309687 is about 505.6814471297.

The spelling of 129309687 in words is "one hundred twenty-nine million, three hundred nine thousand, six hundred eighty-seven".