129909142 has 8 divisors (see below), whose sum is σ = 212578632. Its totient is φ = 59049600.

The previous prime is 129909139. The next prime is 129909151. The reversal of 129909142 is 241909921.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2952459 + ... + 2952502.

It is an arithmetic number, because the mean of its divisors is an integer number (26572329).

Almost surely, 2^129909142 is an apocalyptic number.

129909142 is a deficient number, since it is larger than the sum of its proper divisors (82669490).

129909142 is a wasteful number, since it uses less digits than its factorization.

129909142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5904974.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 129909142 is about 11397.7691676924. The cubic root of 129909142 is about 506.4616569215.

The spelling of 129909142 in words is "one hundred twenty-nine million, nine hundred nine thousand, one hundred forty-two".