129312789 has 8 divisors (see below), whose sum is σ = 172597440. Its totient is φ = 86118336.

The previous prime is 129312731. The next prime is 129312791. The reversal of 129312789 is 987213921.

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

It is not a de Polignac number, because 129312789 - 2⁷ = 129312661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129312789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129312709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19129 + ... + 24990.

It is an arithmetic number, because the mean of its divisors is an integer number (21574680).

Almost surely, 2^129312789 is an apocalyptic number.

It is an amenable number.

129312789 is a deficient number, since it is larger than the sum of its proper divisors (43284651).

129312789 is an equidigital number, since it uses as much as digits as its factorization.

129312789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45099.

The product of its digits is 54432, while the sum is 42.

The square root of 129312789 is about 11371.5781226706. The cubic root of 129312789 is about 505.6854906816.

The spelling of 129312789 in words is "one hundred twenty-nine million, three hundred twelve thousand, seven hundred eighty-nine".