129994999 has 4 divisors (see below), whose sum is σ = 130192920. Its totient is φ = 129797080.

The previous prime is 129994993. The next prime is 129995003. The reversal of 129994999 is 999499921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129994999 - 2⁵ = 129994967 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 (129994993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97972 + ... + 99289.

It is an arithmetic number, because the mean of its divisors is an integer number (32548230).

Almost surely, 2^129994999 is an apocalyptic number.

129994999 is a deficient number, since it is larger than the sum of its proper divisors (197921).

129994999 is an equidigital number, since it uses as much as digits as its factorization.

129994999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197920.

The product of its digits is 4251528, while the sum is 61.

The square root of 129994999 is about 11401.5349405245. The cubic root of 129994999 is about 506.5732059163.

The spelling of 129994999 in words is "one hundred twenty-nine million, nine hundred ninety-four thousand, nine hundred ninety-nine".