129772843 has 4 divisors (see below), whose sum is σ = 130355008. Its totient is φ = 129190680.

The previous prime is 129772813. The next prime is 129772847. The reversal of 129772843 is 348277921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348277921 = 433 ⋅804337.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129772843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129772843.

It is not an unprimeable number, because it can be changed into a prime (129772847) 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, 290748 + ... + 291193.

It is an arithmetic number, because the mean of its divisors is an integer number (32588752).

Almost surely, 2^129772843 is an apocalyptic number.

129772843 is a deficient number, since it is larger than the sum of its proper divisors (582165).

129772843 is an equidigital number, since it uses as much as digits as its factorization.

129772843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582164.

The product of its digits is 169344, while the sum is 43.

The square root of 129772843 is about 11391.7884021781. The cubic root of 129772843 is about 506.2844705889.

The spelling of 129772843 in words is "one hundred twenty-nine million, seven hundred seventy-two thousand, eight hundred forty-three".