129789 has 32 divisors (see below), whose sum is σ = 230400. Its totient is φ = 71280.

The previous prime is 129769. The next prime is 129793. The reversal of 129789 is 987921.

It is a happy number.

It is not a de Polignac number, because 129789 - 2⁵ = 129757 is a prime.

Its product of digits (9072) is a multiple of the sum of its prime divisors (56).

129789 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129719) 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, 5632 + ... + 5654.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

2¹²⁹⁷⁸⁹ is an apocalyptic number.

129789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129789 is a deficient number, since it is larger than the sum of its proper divisors (100611).

129789 is a wasteful number, since it uses less digits than its factorization.

129789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 56 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 129789 is about 360.2624043666. The cubic root of 129789 is about 50.6305480888.

It can be divided in two parts, 12 and 9789, that added together give a square (9801 = 99²).

The spelling of 129789 in words is "one hundred twenty-nine thousand, seven hundred eighty-nine".