129812 has 24 divisors (see below), whose sum is σ = 254016. Its totient is φ = 57728.

The previous prime is 129803. The next prime is 129841. The reversal of 129812 is 218921.

It is a Harshad number since it is a multiple of its sum of digits (23).

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

It is a congruent number.

It is an unprimeable number.

129812 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 7 ways as a sum of consecutive naturals, for example, 1523 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (10584).

2¹²⁹⁸¹² is an apocalyptic number.

It is an amenable number.

129812 is a deficient number, since it is larger than the sum of its proper divisors (124204).

129812 is a wasteful number, since it uses less digits than its factorization.

129812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 125 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 129812 is about 360.2943241296. The cubic root of 129812 is about 50.6335386705.

It can be divided in two parts, 1298 and 12, that multiplied together give a triangular number (15576 = T₁₇₆).

The spelling of 129812 in words is "one hundred twenty-nine thousand, eight hundred twelve".