129755983 has 8 divisors (see below), whose sum is σ = 151741568. Its totient is φ = 108632664.

The previous prime is 129755971. The next prime is 129755993. The reversal of 129755983 is 389557921.

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

It is not a de Polignac number, because 129755983 - 2²⁵ = 96201551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129755933) 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, 215241 + ... + 215842.

It is an arithmetic number, because the mean of its divisors is an integer number (18967696).

Almost surely, 2^129755983 is an apocalyptic number.

129755983 is a deficient number, since it is larger than the sum of its proper divisors (21985585).

129755983 is an equidigital number, since it uses as much as digits as its factorization.

129755983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431133.

The product of its digits is 680400, while the sum is 49.

The square root of 129755983 is about 11391.0483714187. The cubic root of 129755983 is about 506.2625442606.

The spelling of 129755983 in words is "one hundred twenty-nine million, seven hundred fifty-five thousand, nine hundred eighty-three".