129109826 has 8 divisors (see below), whose sum is σ = 203857680. Its totient is φ = 61157268.

The previous prime is 129109819. The next prime is 129109829. The reversal of 129109826 is 628901921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 3397627 = 129109826 / (1 + 2 + 9 + 1 + 0 + 9 + 8 + 2 + 6).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129109826.

It is not an unprimeable number, because it can be changed into a prime (129109829) 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, 1698776 + ... + 1698851.

It is an arithmetic number, because the mean of its divisors is an integer number (25482210).

Almost surely, 2^129109826 is an apocalyptic number.

129109826 is a deficient number, since it is larger than the sum of its proper divisors (74747854).

129109826 is a wasteful number, since it uses less digits than its factorization.

129109826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397648.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 129109826 is about 11362.6504830519. The cubic root of 129109826 is about 505.4207857773.

The spelling of 129109826 in words is "one hundred twenty-nine million, one hundred nine thousand, eight hundred twenty-six".