129349943 has 4 divisors (see below), whose sum is σ = 129400368. Its totient is φ = 129299520.

The previous prime is 129349937. The next prime is 129350009. The reversal of 129349943 is 349943921.

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 129349943 - 2²⁴ = 112572727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129349894 and 129349903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129349933) 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, 21146 + ... + 26567.

It is an arithmetic number, because the mean of its divisors is an integer number (32350092).

Almost surely, 2^129349943 is an apocalyptic number.

129349943 is a deficient number, since it is larger than the sum of its proper divisors (50425).

129349943 is an equidigital number, since it uses as much as digits as its factorization.

129349943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50424.

The product of its digits is 209952, while the sum is 44.

The square root of 129349943 is about 11373.2116396381. The cubic root of 129349943 is about 505.7339170328.

The spelling of 129349943 in words is "one hundred twenty-nine million, three hundred forty-nine thousand, nine hundred forty-three".