129257272 has 16 divisors (see below), whose sum is σ = 245426400. Its totient is φ = 63810240.

The previous prime is 129257221. The next prime is 129257279. The reversal of 129257272 is 272752921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129257279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101629 + ... + 102892.

It is an arithmetic number, because the mean of its divisors is an integer number (15339150).

Almost surely, 2^129257272 is an apocalyptic number.

It is an amenable number.

129257272 is a deficient number, since it is larger than the sum of its proper divisors (116169128).

129257272 is a wasteful number, since it uses less digits than its factorization.

129257272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204606 (or 204602 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 129257272 is about 11369.1368185980. The cubic root of 129257272 is about 505.6131127928.

It can be divided in two parts, 1292 and 57272, that added together give a square (58564 = 242²).

The spelling of 129257272 in words is "one hundred twenty-nine million, two hundred fifty-seven thousand, two hundred seventy-two".