129505943 has 4 divisors (see below), whose sum is σ = 148006800. Its totient is φ = 111005088.

The previous prime is 129505933. The next prime is 129505951. The reversal of 129505943 is 349505921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129505943 - 2²⁰ = 128457367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129505897 and 129505906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129505903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9250418 + ... + 9250431.

It is an arithmetic number, because the mean of its divisors is an integer number (37001700).

Almost surely, 2^129505943 is an apocalyptic number.

129505943 is a deficient number, since it is larger than the sum of its proper divisors (18500857).

129505943 is an equidigital number, since it uses as much as digits as its factorization.

129505943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18500856.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 129505943 is about 11380.0677941742. The cubic root of 129505943 is about 505.9371455617.

The spelling of 129505943 in words is "one hundred twenty-nine million, five hundred five thousand, nine hundred forty-three".