129997973 has 8 divisors (see below), whose sum is σ = 153361920. Its totient is φ = 107832240.

The previous prime is 129997969. The next prime is 129997991. The reversal of 129997973 is 379799921.

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 129997973 - 2² = 129997969 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 (129997913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299318 + ... + 299751.

It is an arithmetic number, because the mean of its divisors is an integer number (19170240).

Almost surely, 2^129997973 is an apocalyptic number.

It is an amenable number.

129997973 is a deficient number, since it is larger than the sum of its proper divisors (23363947).

129997973 is an equidigital number, since it uses as much as digits as its factorization.

129997973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599107.

The product of its digits is 1928934, while the sum is 56.

The square root of 129997973 is about 11401.6653608146. The cubic root of 129997973 is about 506.5770689809.

The spelling of 129997973 in words is "one hundred twenty-nine million, nine hundred ninety-seven thousand, nine hundred seventy-three".