129487 has 4 divisors (see below), whose sum is σ = 133696. Its totient is φ = 125280.

The previous prime is 129469. The next prime is 129491. The reversal of 129487 is 784921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784921 = 23 ⋅34127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4177 = 129487 / (1 + 2 + 9 + 4 + 8 + 7).

It is a Duffinian number.

129487 is a lucky number.

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 (129457) 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, 2058 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (33424).

2¹²⁹⁴⁸⁷ is an apocalyptic number.

129487 is a deficient number, since it is larger than the sum of its proper divisors (4209).

129487 is an equidigital number, since it uses as much as digits as its factorization.

129487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its digits is 4032, while the sum is 31.

The square root of 129487 is about 359.8430213301. The cubic root of 129487 is about 50.5912476334.

It can be divided in two parts, 129 and 487, that added together give a palindrome (616).

The spelling of 129487 in words is "one hundred twenty-nine thousand, four hundred eighty-seven".