129872196 has 18 divisors (see below), whose sum is σ = 328288142. Its totient is φ = 43290720.

The previous prime is 129872189. The next prime is 129872203. The reversal of 129872196 is 691278921.

It is an interprime number because it is at equal distance from previous prime (129872189) and next prime (129872203).

It can be written as a sum of positive squares in only one way, i.e., 114190596 + 15681600 = 10686^2 + 3960^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1803745 + ... + 1803816.

Almost surely, 2^129872196 is an apocalyptic number.

It is an amenable number.

129872196 is an abundant number, since it is smaller than the sum of its proper divisors (198415946).

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

129872196 is a wasteful number, since it uses less digits than its factorization.

129872196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607571 (or 3607566 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 129872196 is about 11396.1482966834. The cubic root of 129872196 is about 506.4136400120.

The spelling of 129872196 in words is "one hundred twenty-nine million, eight hundred seventy-two thousand, one hundred ninety-six".