129942 has 12 divisors (see below), whose sum is σ = 281580. Its totient is φ = 43308.

The previous prime is 129937. The next prime is 129953. The reversal of 129942 is 249921.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

129942 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3592 + ... + 3627.

It is an arithmetic number, because the mean of its divisors is an integer number (23465).

2¹²⁹⁹⁴² is an apocalyptic number.

129942 is an abundant number, since it is smaller than the sum of its proper divisors (151638).

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

129942 is a wasteful number, since it uses less digits than its factorization.

129942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7227 (or 7224 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 129942 is about 360.4746870447. The cubic root of 129942 is about 50.6504353209.

It can be divided in two parts, 12994 and 2, that added together give a square (12996 = 114²).

The spelling of 129942 in words is "one hundred twenty-nine thousand, nine hundred forty-two".