129973709 has 4 divisors (see below), whose sum is σ = 130014240. Its totient is φ = 129933180.

The previous prime is 129973673. The next prime is 129973717. The reversal of 129973709 is 907379921.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129973709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129973729) 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, 14999 + ... + 22020.

It is an arithmetic number, because the mean of its divisors is an integer number (32503560).

Almost surely, 2^129973709 is an apocalyptic number.

It is an amenable number.

129973709 is a deficient number, since it is larger than the sum of its proper divisors (40531).

129973709 is an equidigital number, since it uses as much as digits as its factorization.

129973709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40530.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 129973709 is about 11400.6012560742. The cubic root of 129973709 is about 506.5455496412.

The spelling of 129973709 in words is "one hundred twenty-nine million, nine hundred seventy-three thousand, seven hundred nine".