129196478 has 8 divisors (see below), whose sum is σ = 194323872. Its totient is φ = 64421856.

The previous prime is 129196471. The next prime is 129196511. The reversal of 129196478 is 874691921.

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 (129196471) 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 3 ways as a sum of consecutive naturals, for example, 87275 + ... + 88742.

It is an arithmetic number, because the mean of its divisors is an integer number (24290484).

Almost surely, 2^129196478 is an apocalyptic number.

129196478 is a deficient number, since it is larger than the sum of its proper divisors (65127394).

129196478 is a wasteful number, since it uses less digits than its factorization.

129196478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176386.

The product of its digits is 217728, while the sum is 47.

The square root of 129196478 is about 11366.4628622980. The cubic root of 129196478 is about 505.5338314664.

The spelling of 129196478 in words is "one hundred twenty-nine million, one hundred ninety-six thousand, four hundred seventy-eight".