129040266 has 32 divisors (see below), whose sum is σ = 266172480. Its totient is φ = 41684864.

The previous prime is 129040253. The next prime is 129040277. The reversal of 129040266 is 662040921.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23950 + ... + 28838.

It is an arithmetic number, because the mean of its divisors is an integer number (8317890).

Almost surely, 2^129040266 is an apocalyptic number.

129040266 is an abundant number, since it is smaller than the sum of its proper divisors (137132214).

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

129040266 is a wasteful number, since it uses less digits than its factorization.

129040266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 129040266 is about 11359.5891651063. The cubic root of 129040266 is about 505.3300016063.

The spelling of 129040266 in words is "one hundred twenty-nine million, forty thousand, two hundred sixty-six".