129397243 has 2 divisors, whose sum is σ = 129397244. Its totient is φ = 129397242.

The previous prime is 129397237. The next prime is 129397259. The reversal of 129397243 is 342793921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129397243 - 2²⁵ = 95842811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129397196 and 129397205.

It is not a weakly prime, because it can be changed into another prime (129397943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64698621 + 64698622.

It is an arithmetic number, because the mean of its divisors is an integer number (64698622).

Almost surely, 2^129397243 is an apocalyptic number.

129397243 is a deficient number, since it is larger than the sum of its proper divisors (1).

129397243 is an equidigital number, since it uses as much as digits as its factorization.

129397243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 129397243 is about 11375.2908973793. The cubic root of 129397243 is about 505.7955542177.

The spelling of 129397243 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, two hundred forty-three".