129478447 has 8 divisors (see below), whose sum is σ = 148728096. Its totient is φ = 110416992.

The previous prime is 129478439. The next prime is 129478457. The reversal of 129478447 is 744874921.

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

It is not a de Polignac number, because 129478447 - 2³ = 129478439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129478397 and 129478406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129478457) 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, 45568 + ... + 48325.

It is an arithmetic number, because the mean of its divisors is an integer number (18591012).

Almost surely, 2^129478447 is an apocalyptic number.

129478447 is a deficient number, since it is larger than the sum of its proper divisors (19249649).

129478447 is an equidigital number, since it uses as much as digits as its factorization.

129478447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94097.

The product of its digits is 451584, while the sum is 46.

The square root of 129478447 is about 11378.8596528826. The cubic root of 129478447 is about 505.9013370830.

The spelling of 129478447 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, four hundred forty-seven".