129745 has 16 divisors (see below), whose sum is σ = 194688. Its totient is φ = 80640.

The previous prime is 129737. The next prime is 129749. The reversal of 129745 is 547921.

It is a happy number.

It is not a de Polignac number, because 129745 - 2³ = 129737 is a prime.

It is a Duffinian number.

Its product of digits (2520) is a multiple of the sum of its prime divisors (360).

It is not an unprimeable number, because it can be changed into a prime (129749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (12168).

2¹²⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

129745 is a deficient number, since it is larger than the sum of its proper divisors (64943).

129745 is a wasteful number, since it uses less digits than its factorization.

129745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its digits is 2520, while the sum is 28.

The square root of 129745 is about 360.2013325905. The cubic root of 129745 is about 50.6248259914.

Multiplying 129745 by its sum of digits (28), we get a triangular number (3632860 = T₂₆₉₅).

The spelling of 129745 in words is "one hundred twenty-nine thousand, seven hundred forty-five".