129231636 has 24 divisors (see below), whose sum is σ = 303713760. Its totient is φ = 42766752.

The previous prime is 129231607. The next prime is 129231701. The reversal of 129231636 is 636132921.

It is a junction number, because it is equal to n+sod(n) for n = 129231597 and 129231606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37071 + ... + 40406.

It is an arithmetic number, because the mean of its divisors is an integer number (12654740).

Almost surely, 2^129231636 is an apocalyptic number.

It is an amenable number.

129231636 is an abundant number, since it is smaller than the sum of its proper divisors (174482124).

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

129231636 is a wasteful number, since it uses less digits than its factorization.

129231636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77623 (or 77621 counting only the distinct ones).

The product of its digits is 11664, while the sum is 33.

The square root of 129231636 is about 11368.0093244156. The cubic root of 129231636 is about 505.5796839714.

The spelling of 129231636 in words is "one hundred twenty-nine million, two hundred thirty-one thousand, six hundred thirty-six".