129858 has 16 divisors (see below), whose sum is σ = 271296. Its totient is φ = 41360.

The previous prime is 129853. The next prime is 129887. The reversal of 129858 is 858921.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 333 + ... + 608.

It is an arithmetic number, because the mean of its divisors is an integer number (16956).

2¹²⁹⁸⁵⁸ is an apocalyptic number.

129858 is an abundant number, since it is smaller than the sum of its proper divisors (141438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129858 is a wasteful number, since it uses less digits than its factorization.

129858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 5760, while the sum is 33.

The square root of 129858 is about 360.3581551734. The cubic root of 129858 is about 50.6395187743.

It can be divided in two parts, 12 and 9858, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 129858 in words is "one hundred twenty-nine thousand, eight hundred fifty-eight".