129138795 has 12 divisors (see below), whose sum is σ = 223840656. Its totient is φ = 68874000.

The previous prime is 129138781. The next prime is 129138797. The reversal of 129138795 is 597831921.

It is not a de Polignac number, because 129138795 - 2⁹ = 129138283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2869751 = 129138795 / (1 + 2 + 9 + 1 + 3 + 8 + 7 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 129138795.

It is not an unprimeable number, because it can be changed into a prime (129138797) 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 11 ways as a sum of consecutive naturals, for example, 1434831 + ... + 1434920.

It is an arithmetic number, because the mean of its divisors is an integer number (18653388).

Almost surely, 2^129138795 is an apocalyptic number.

129138795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129138795 is a deficient number, since it is larger than the sum of its proper divisors (94701861).

129138795 is a wasteful number, since it uses less digits than its factorization.

129138795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869762 (or 2869759 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 129138795 is about 11363.9251581485. The cubic root of 129138795 is about 505.4585841909.

The spelling of 129138795 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, seven hundred ninety-five".