129120789 has 32 divisors (see below), whose sum is σ = 214272000. Its totient is φ = 67483584.

The previous prime is 129120779. The next prime is 129120793. The reversal of 129120789 is 987021921.

It is not a de Polignac number, because 129120789 - 2¹² = 129116693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129120709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5992 + ... + 17150.

It is an arithmetic number, because the mean of its divisors is an integer number (6696000).

Almost surely, 2^129120789 is an apocalyptic number.

129120789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129120789 is a deficient number, since it is larger than the sum of its proper divisors (85151211).

129120789 is a wasteful number, since it uses less digits than its factorization.

129120789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11217.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 129120789 is about 11363.1328866647. The cubic root of 129120789 is about 505.4350908369.

The spelling of 129120789 in words is "one hundred twenty-nine million, one hundred twenty thousand, seven hundred eighty-nine".