129219975 has 48 divisors (see below), whose sum is σ = 251367840. Its totient is φ = 64857600.

The previous prime is 129219973. The next prime is 129219991. The reversal of 129219975 is 579912921.

It is not a de Polignac number, because 129219975 - 2¹ = 129219973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129219975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129219973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5845 + ... + 17105.

It is an arithmetic number, because the mean of its divisors is an integer number (5236830).

Almost surely, 2^129219975 is an apocalyptic number.

129219975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129219975 is a deficient number, since it is larger than the sum of its proper divisors (122147865).

129219975 is a wasteful number, since it uses less digits than its factorization.

129219975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11297 (or 11286 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 129219975 is about 11367.4964262145. The cubic root of 129219975 is about 505.5644768023.

The spelling of 129219975 in words is "one hundred twenty-nine million, two hundred nineteen thousand, nine hundred seventy-five".