129140268 has 12 divisors (see below), whose sum is σ = 301327320. Its totient is φ = 43046752.

The previous prime is 129140251. The next prime is 129140269. The reversal of 129140268 is 862041921.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×129140268² = 33354417638223648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129140269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380833 + ... + 5380856.

It is an arithmetic number, because the mean of its divisors is an integer number (25110610).

Almost surely, 2^129140268 is an apocalyptic number.

It is an amenable number.

129140268 is an abundant number, since it is smaller than the sum of its proper divisors (172187052).

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

129140268 is a wasteful number, since it uses less digits than its factorization.

129140268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761696 (or 10761694 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 129140268 is about 11363.9899683166. The cubic root of 129140268 is about 505.4605059931.

The spelling of 129140268 in words is "one hundred twenty-nine million, one hundred forty thousand, two hundred sixty-eight".