129271272 has 32 divisors (see below), whose sum is σ = 348038880. Its totient is φ = 39775680.

The previous prime is 129271249. The next prime is 129271277. The reversal of 129271272 is 272172921.

It is a super-2 number, since 2×129271272² = 33422123528995968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129271277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206854 + ... + 207477.

It is an arithmetic number, because the mean of its divisors is an integer number (10876215).

Almost surely, 2^129271272 is an apocalyptic number.

129271272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129271272 is an abundant number, since it is smaller than the sum of its proper divisors (218767608).

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

129271272 is a wasteful number, since it uses less digits than its factorization.

129271272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414353 (or 414349 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 129271272 is about 11369.7525039026. The cubic root of 129271272 is about 505.6313666415.

The spelling of 129271272 in words is "one hundred twenty-nine million, two hundred seventy-one thousand, two hundred seventy-two".