129947 has 4 divisors (see below), whose sum is σ = 130800. Its totient is φ = 129096.

The previous prime is 129937. The next prime is 129953. The reversal of 129947 is 749921.

129947 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 129947 - 2¹⁰ = 128923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128 + ... + 525.

It is an arithmetic number, because the mean of its divisors is an integer number (32700).

2¹²⁹⁹⁴⁷ is an apocalyptic number.

129947 is a deficient number, since it is larger than the sum of its proper divisors (853).

129947 is an equidigital number, since it uses as much as digits as its factorization.

129947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852.

The product of its digits is 4536, while the sum is 32.

The square root of 129947 is about 360.4816222778. The cubic root of 129947 is about 50.6510849670.

The spelling of 129947 in words is "one hundred twenty-nine thousand, nine hundred forty-seven".