129111426 has 24 divisors (see below), whose sum is σ = 287303484. Its totient is φ = 41873760.

The previous prime is 129111421. The next prime is 129111439. The reversal of 129111426 is 624111921.

129111426 is a `hidden beast` number, since 129 + 111 + 426 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 108180801 + 20930625 = 10401^2 + 4575^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129111426.

It is not an unprimeable number, because it can be changed into a prime (129111421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96265 + ... + 97596.

Almost surely, 2^129111426 is an apocalyptic number.

129111426 is an abundant number, since it is smaller than the sum of its proper divisors (158192058).

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

129111426 is a wasteful number, since it uses less digits than its factorization.

129111426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193906 (or 193903 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 129111426 is about 11362.7208889420. The cubic root of 129111426 is about 505.4228735862.

The spelling of 129111426 in words is "one hundred twenty-nine million, one hundred eleven thousand, four hundred twenty-six".