129268 has 12 divisors (see below), whose sum is σ = 239652. Its totient is φ = 60800.

The previous prime is 129263. The next prime is 129277. The reversal of 129268 is 862921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51984 + 77284 = 228^2 + 278^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883 + ... + 1018.

It is an arithmetic number, because the mean of its divisors is an integer number (19971).

2¹²⁹²⁶⁸ is an apocalyptic number.

It is an amenable number.

129268 is a deficient number, since it is larger than the sum of its proper divisors (110384).

129268 is a wasteful number, since it uses less digits than its factorization.

129268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922 (or 1920 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 129268 is about 359.5385931997. The cubic root of 129268 is about 50.5627100574.

The spelling of 129268 in words is "one hundred twenty-nine thousand, two hundred sixty-eight".