129011806 has 24 divisors (see below), whose sum is σ = 245579256. Its totient is φ = 50263920.

The previous prime is 129011803. The next prime is 129011821. The reversal of 129011806 is 608110921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129011803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58761 + ... + 60916.

It is an arithmetic number, because the mean of its divisors is an integer number (10232469).

Almost surely, 2^129011806 is an apocalyptic number.

129011806 is a deficient number, since it is larger than the sum of its proper divisors (116567450).

129011806 is a wasteful number, since it uses less digits than its factorization.

129011806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119704 (or 119697 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 129011806 is about 11358.3364098797. The cubic root of 129011806 is about 505.2928484765.

The spelling of 129011806 in words is "one hundred twenty-nine million, eleven thousand, eight hundred six".