129747 has 8 divisors (see below), whose sum is σ = 176080. Its totient is φ = 84960.

The previous prime is 129737. The next prime is 129749. The reversal of 129747 is 747921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129747 - 2⁸ = 129491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129749) 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, 172 + ... + 537.

It is an arithmetic number, because the mean of its divisors is an integer number (22010).

2¹²⁹⁷⁴⁷ is an apocalyptic number.

129747 is a deficient number, since it is larger than the sum of its proper divisors (46333).

129747 is an equidigital number, since it uses as much as digits as its factorization.

129747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773.

The product of its digits is 3528, while the sum is 30.

The square root of 129747 is about 360.2041088050. The cubic root of 129747 is about 50.6250861148.

It can be divided in two parts, 12 and 9747, that multiplied together give a square (116964 = 342²).

The spelling of 129747 in words is "one hundred twenty-nine thousand, seven hundred forty-seven".