129240673 has 8 divisors (see below), whose sum is σ = 130659048. Its totient is φ = 127830144.

The previous prime is 129240649. The next prime is 129240677. The reversal of 129240673 is 376042921.

It can be written as a sum of positive squares in 4 ways, for example, as 11235904 + 118004769 = 3352^2 + 10863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129240673 - 2⁹ = 129240161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129240677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34815 + ... + 38347.

It is an arithmetic number, because the mean of its divisors is an integer number (16332381).

Almost surely, 2^129240673 is an apocalyptic number.

It is an amenable number.

129240673 is a deficient number, since it is larger than the sum of its proper divisors (1418375).

129240673 is a wasteful number, since it uses less digits than its factorization.

129240673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 129240673 is about 11368.4067925105. The cubic root of 129240673 is about 505.5914685397.

The spelling of 129240673 in words is "one hundred twenty-nine million, two hundred forty thousand, six hundred seventy-three".