129439641 has 4 divisors (see below), whose sum is σ = 172586192. Its totient is φ = 86293092.

The previous prime is 129439637. The next prime is 129439657. The reversal of 129439641 is 146934921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 129439641 - 2² = 129439637 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 129439641.

It is not an unprimeable number, because it can be changed into a prime (129439631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21573271 + ... + 21573276.

It is an arithmetic number, because the mean of its divisors is an integer number (43146548).

Almost surely, 2^129439641 is an apocalyptic number.

It is an amenable number.

129439641 is a deficient number, since it is larger than the sum of its proper divisors (43146551).

129439641 is an equidigital number, since it uses as much as digits as its factorization.

129439641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43146550.

The product of its digits is 46656, while the sum is 39.

The square root of 129439641 is about 11377.1543454416. The cubic root of 129439641 is about 505.8507907840.

The spelling of 129439641 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, six hundred forty-one".