129075 has 12 divisors (see below), whose sum is σ = 213528. Its totient is φ = 68800.

The previous prime is 129061. The next prime is 129083. The reversal of 129075 is 570921.

It is not a de Polignac number, because 129075 - 2⁶ = 129011 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 786 + ... + 935.

It is an arithmetic number, because the mean of its divisors is an integer number (17794).

2¹²⁹⁰⁷⁵ is an apocalyptic number.

129075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129075 is a deficient number, since it is larger than the sum of its proper divisors (84453).

129075 is a wasteful number, since it uses less digits than its factorization.

129075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 129075 is about 359.2700933838. The cubic root of 129075 is about 50.5375337733.

Adding to 129075 its reverse (570921), we get a palindrome (699996).

It can be divided in two parts, 12 and 9075, that multiplied together give a square (108900 = 330²).

The spelling of 129075 in words is "one hundred twenty-nine thousand, seventy-five".