129043836 has 36 divisors (see below), whose sum is σ = 326550952. Its totient is φ = 42967584.

The previous prime is 129043829. The next prime is 129043841. The reversal of 129043836 is 638340921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 129043836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51075 + ... + 53541.

Almost surely, 2^129043836 is an apocalyptic number.

It is an amenable number.

129043836 is an abundant number, since it is smaller than the sum of its proper divisors (197507116).

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

129043836 is a wasteful number, since it uses less digits than its factorization.

129043836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930 (or 3925 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 129043836 is about 11359.7462999840. The cubic root of 129043836 is about 505.3346616801.

The spelling of 129043836 in words is "one hundred twenty-nine million, forty-three thousand, eight hundred thirty-six".