129027447 has 12 divisors (see below), whose sum is σ = 194476464. Its totient is φ = 82278240.

The previous prime is 129027419. The next prime is 129027463. The reversal of 129027447 is 744720921.

It is not a de Polignac number, because 129027447 - 2⁸ = 129027191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129027407) 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 11 ways as a sum of consecutive naturals, for example, 311454 + ... + 311867.

It is an arithmetic number, because the mean of its divisors is an integer number (16206372).

Almost surely, 2^129027447 is an apocalyptic number.

129027447 is a deficient number, since it is larger than the sum of its proper divisors (65449017).

129027447 is a wasteful number, since it uses less digits than its factorization.

129027447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623350 (or 623347 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 129027447 is about 11359.0249141377. The cubic root of 129027447 is about 505.3132677087.

The spelling of 129027447 in words is "one hundred twenty-nine million, twenty-seven thousand, four hundred forty-seven".