129788689 has 4 divisors (see below), whose sum is σ = 130345956. Its totient is φ = 129231424.

The previous prime is 129788669. The next prime is 129788767. The reversal of 129788689 is 986887921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25401600 + 104387089 = 5040^2 + 10217^2 .

It is a cyclic number.

It is not a de Polignac number, because 129788689 - 2⁹ = 129788177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129788629) 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, 278284 + ... + 278749.

It is an arithmetic number, because the mean of its divisors is an integer number (32586489).

Almost surely, 2^129788689 is an apocalyptic number.

It is an amenable number.

129788689 is a deficient number, since it is larger than the sum of its proper divisors (557267).

129788689 is an equidigital number, since it uses as much as digits as its factorization.

129788689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557266.

The product of its digits is 3483648, while the sum is 58.

The square root of 129788689 is about 11392.4838819285. The cubic root of 129788689 is about 506.3050764851.

The spelling of 129788689 in words is "one hundred twenty-nine million, seven hundred eighty-eight thousand, six hundred eighty-nine".