129478431 has 8 divisors (see below), whose sum is σ = 180144000. Its totient is φ = 82565912.

The previous prime is 129478411. The next prime is 129478439. The reversal of 129478431 is 134874921.

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

It is a cyclic number.

It is not a de Polignac number, because 129478431 - 2²⁵ = 95923999 is a prime.

It is a super-2 number, since 2×129478431² = 33529328188443522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129478431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129478439) 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, 938181 + ... + 938318.

It is an arithmetic number, because the mean of its divisors is an integer number (22518000).

Almost surely, 2^129478431 is an apocalyptic number.

129478431 is a deficient number, since it is larger than the sum of its proper divisors (50665569).

129478431 is a wasteful number, since it uses less digits than its factorization.

129478431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876525.

The product of its digits is 48384, while the sum is 39.

The square root of 129478431 is about 11378.8589498245. The cubic root of 129478431 is about 505.9013162445.

The spelling of 129478431 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, four hundred thirty-one".