129855 has 16 divisors (see below), whose sum is σ = 226944. Its totient is φ = 62880.

The previous prime is 129853. The next prime is 129887. The reversal of 129855 is 558921.

It is not a de Polignac number, because 129855 - 2¹ = 129853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (14184).

2¹²⁹⁸⁵⁵ is an apocalyptic number.

129855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129855 is a deficient number, since it is larger than the sum of its proper divisors (97089).

129855 is a wasteful number, since it uses less digits than its factorization.

129855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806.

The product of its digits is 3600, while the sum is 30.

The square root of 129855 is about 360.3539926239. The cubic root of 129855 is about 50.6391288106.

The spelling of 129855 in words is "one hundred twenty-nine thousand, eight hundred fifty-five".