129429478 has 8 divisors (see below), whose sum is σ = 199391472. Its totient is φ = 62965656.

The previous prime is 129429473. The next prime is 129429529. The reversal of 129429478 is 874924921.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129429473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 874450 + ... + 874597.

It is an arithmetic number, because the mean of its divisors is an integer number (24923934).

Almost surely, 2^129429478 is an apocalyptic number.

129429478 is a deficient number, since it is larger than the sum of its proper divisors (69961994).

129429478 is a wasteful number, since it uses less digits than its factorization.

129429478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749086.

The product of its digits is 290304, while the sum is 46.

The square root of 129429478 is about 11376.7076959901. The cubic root of 129429478 is about 505.8375514185.

The spelling of 129429478 in words is "one hundred twenty-nine million, four hundred twenty-nine thousand, four hundred seventy-eight".