129867156 has 18 divisors (see below), whose sum is σ = 328275402. Its totient is φ = 43289040.

The previous prime is 129867139. The next prime is 129867163. The reversal of 129867156 is 651768921.

It can be written as a sum of positive squares in only one way, i.e., 90554256 + 39312900 = 9516^2 + 6270^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1803675 + ... + 1803746.

Almost surely, 2^129867156 is an apocalyptic number.

It is an amenable number.

129867156 is an abundant number, since it is smaller than the sum of its proper divisors (198408246).

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

129867156 is a wasteful number, since it uses less digits than its factorization.

129867156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607431 (or 3607426 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 129867156 is about 11395.9271671944. The cubic root of 129867156 is about 506.4070890647.

The spelling of 129867156 in words is "one hundred twenty-nine million, eight hundred sixty-seven thousand, one hundred fifty-six".