129397639 has 8 divisors (see below), whose sum is σ = 148039328. Its totient is φ = 110795040.

The previous prime is 129397613. The next prime is 129397651. The reversal of 129397639 is 936793921.

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 129397639 - 2⁵ = 129397607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129397592 and 129397601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129397669) 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 7 ways as a sum of consecutive naturals, for example, 2292 + ... + 16249.

It is an arithmetic number, because the mean of its divisors is an integer number (18504916).

Almost surely, 2^129397639 is an apocalyptic number.

129397639 is a deficient number, since it is larger than the sum of its proper divisors (18641689).

129397639 is an equidigital number, since it uses as much as digits as its factorization.

129397639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19545.

The product of its digits is 551124, while the sum is 49.

The square root of 129397639 is about 11375.3083035142. The cubic root of 129397639 is about 505.7960701866.

The spelling of 129397639 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, six hundred thirty-nine".