129276 has 72 divisors (see below), whose sum is σ = 407680. Its totient is φ = 34992.

The previous prime is 129263. The next prime is 129277. The reversal of 129276 is 672921.

129276 = T₃₈ + T₃₉ + ... + T₉₃.

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 zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129277) by changing a digit.

129276 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 23 ways as a sum of consecutive naturals, for example, 6795 + ... + 6813.

129276 is a Friedman number, since it can be written as 76*21*9^2, using all its digits and the basic arithmetic operations.

2¹²⁹²⁷⁶ 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 129276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203840).

129276 is an abundant number, since it is smaller than the sum of its proper divisors (278404).

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

129276 is a wasteful number, since it uses less digits than its factorization.

129276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 31 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 129276 is about 359.5497183979. The cubic root of 129276 is about 50.5637530929.

The spelling of 129276 in words is "one hundred twenty-nine thousand, two hundred seventy-six".