129816 has 32 divisors (see below), whose sum is σ = 361200. Its totient is φ = 43200.

The previous prime is 129803. The next prime is 129841. The reversal of 129816 is 618921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

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

It is a self number, because there is not a number n which added to its sum of digits gives 129816.

It is a congruent number.

It is an unprimeable number.

129816 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, 85 + ... + 516.

2¹²⁹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180600).

129816 is an abundant number, since it is smaller than the sum of its proper divisors (231384).

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

129816 is a wasteful number, since it uses less digits than its factorization.

129816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 606 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 129816 is about 360.2998751041. The cubic root of 129816 is about 50.6340587356.

The spelling of 129816 in words is "one hundred twenty-nine thousand, eight hundred sixteen".