129976126 has 12 divisors (see below), whose sum is σ = 226795248. Its totient is φ = 55704012.

The previous prime is 129976117. The next prime is 129976139. The reversal of 129976126 is 621679921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 663046 + ... + 663241.

It is an arithmetic number, because the mean of its divisors is an integer number (18899604).

Almost surely, 2^129976126 is an apocalyptic number.

129976126 is a deficient number, since it is larger than the sum of its proper divisors (96819122).

129976126 is a wasteful number, since it uses less digits than its factorization.

129976126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326303 (or 1326296 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 129976126 is about 11400.7072587625. The cubic root of 129976126 is about 506.5486895403.

The spelling of 129976126 in words is "one hundred twenty-nine million, nine hundred seventy-six thousand, one hundred twenty-six".