129969688 has 16 divisors (see below), whose sum is σ = 254288880. Its totient is φ = 62159328.

The previous prime is 129969673. The next prime is 129969737. The reversal of 129969688 is 886969921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352995 + ... + 353362.

It is an arithmetic number, because the mean of its divisors is an integer number (15893055).

Almost surely, 2^129969688 is an apocalyptic number.

It is an amenable number.

129969688 is a deficient number, since it is larger than the sum of its proper divisors (124319192).

129969688 is a wasteful number, since it uses less digits than its factorization.

129969688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706386 (or 706382 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 58.

The square root of 129969688 is about 11400.4249043621. The cubic root of 129969688 is about 506.5403259164.

The spelling of 129969688 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, six hundred eighty-eight".