129275818 has 24 divisors (see below), whose sum is σ = 225968292. Its totient is φ = 55306944.

The previous prime is 129275777. The next prime is 129275831. The reversal of 129275818 is 818572921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 111576969 + 17698849 = 10563^2 + 4207^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100596 + ... + 101872.

Almost surely, 2^129275818 is an apocalyptic number.

129275818 is a deficient number, since it is larger than the sum of its proper divisors (96692474).

129275818 is a wasteful number, since it uses less digits than its factorization.

129275818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326 (or 2319 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 129275818 is about 11369.9524185460. The cubic root of 129275818 is about 505.6372936434.

The spelling of 129275818 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, eight hundred eighteen".