129444217 has 8 divisors (see below), whose sum is σ = 148038336. Its totient is φ = 110875632.

The previous prime is 129444199. The next prime is 129444229. The reversal of 129444217 is 712444921.

It is a happy number.

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

It is not a de Polignac number, because 129444217 - 2⁷ = 129444089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129444247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6123 + ... + 17215.

It is an arithmetic number, because the mean of its divisors is an integer number (18504792).

Almost surely, 2^129444217 is an apocalyptic number.

It is an amenable number.

129444217 is a deficient number, since it is larger than the sum of its proper divisors (18594119).

129444217 is a wasteful number, since it uses less digits than its factorization.

129444217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12767.

The product of its digits is 16128, while the sum is 34.

The square root of 129444217 is about 11377.3554484335. The cubic root of 129444217 is about 505.8567517243.

It can be divided in two parts, 12944 and 4217, that added together give a square (17161 = 131²).

The spelling of 129444217 in words is "one hundred twenty-nine million, four hundred forty-four thousand, two hundred seventeen".