129406236 has 24 divisors (see below), whose sum is σ = 312360720. Its totient is φ = 41647872.

The previous prime is 129406229. The next prime is 129406237. The reversal of 129406236 is 632604921.

It is a junction number, because it is equal to n+sod(n) for n = 129406197 and 129406206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129406237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185581 + ... + 186276.

It is an arithmetic number, because the mean of its divisors is an integer number (13015030).

Almost surely, 2^129406236 is an apocalyptic number.

It is an amenable number.

129406236 is an abundant number, since it is smaller than the sum of its proper divisors (182954484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129406236 is a wasteful number, since it uses less digits than its factorization.

129406236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371893 (or 371891 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 129406236 is about 11375.6861771060. The cubic root of 129406236 is about 505.8072714021.

The spelling of 129406236 in words is "one hundred twenty-nine million, four hundred six thousand, two hundred thirty-six".