129769 has 2 divisors, whose sum is σ = 129770. Its totient is φ = 129768.

The previous prime is 129763. The next prime is 129793. The reversal of 129769 is 967921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 169 = 360^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 129769 - 2⁵ = 129737 is a prime.

It is a super-2 number, since 2×129769² = 33679986722, which contains 22 as substring.

129769 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (129763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64884 + 64885.

It is an arithmetic number, because the mean of its divisors is an integer number (64885).

2¹²⁹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

129769 is a deficient number, since it is larger than the sum of its proper divisors (1).

129769 is an equidigital number, since it uses as much as digits as its factorization.

129769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 129769 is about 360.2346457519. The cubic root of 129769 is about 50.6279472958.

It can be divided in two parts, 129 and 769, that added together give a palindrome (898).

The spelling of 129769 in words is "one hundred twenty-nine thousand, seven hundred sixty-nine".