129067789 has 4 divisors (see below), whose sum is σ = 134679456. Its totient is φ = 123456124.

The previous prime is 129067769. The next prime is 129067793. The reversal of 129067789 is 987760921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129067789 - 2²⁵ = 95513357 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 (129067709) 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, 2805799 + ... + 2805844.

It is an arithmetic number, because the mean of its divisors is an integer number (33669864).

Almost surely, 2^129067789 is an apocalyptic number.

It is an amenable number.

129067789 is a deficient number, since it is larger than the sum of its proper divisors (5611667).

129067789 is an equidigital number, since it uses as much as digits as its factorization.

129067789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611666.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 129067789 is about 11360.8005439758. The cubic root of 129067789 is about 505.3659263332.

The spelling of 129067789 in words is "one hundred twenty-nine million, sixty-seven thousand, seven hundred eighty-nine".