129868036 has 12 divisors (see below), whose sum is σ = 227420620. Its totient is φ = 64890720.

The previous prime is 129868031. The next prime is 129868069. The reversal of 129868036 is 630868921.

It can be written as a sum of positive squares in 2 ways, for example, as 67141636 + 62726400 = 8194^2 + 7920^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129867983 and 129868001.

It is not an unprimeable number, because it can be changed into a prime (129868031) 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 3 ways as a sum of consecutive naturals, for example, 3531 + ... + 16498.

Almost surely, 2^129868036 is an apocalyptic number.

It is an amenable number.

129868036 is a deficient number, since it is larger than the sum of its proper divisors (97552584).

129868036 is a wasteful number, since it uses less digits than its factorization.

129868036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21654 (or 21652 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 129868036 is about 11395.9657774144. The cubic root of 129868036 is about 506.4082328931.

The spelling of 129868036 in words is "one hundred twenty-nine million, eight hundred sixty-eight thousand, thirty-six".