129478451 has 8 divisors (see below), whose sum is σ = 133815024. Its totient is φ = 125198080.

The previous prime is 129478439. The next prime is 129478457. The reversal of 129478451 is 154874921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129478451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129478399 and 129478408.

It is not an unprimeable number, because it can be changed into a prime (129478457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9341 + ... + 18606.

It is an arithmetic number, because the mean of its divisors is an integer number (16726878).

Almost surely, 2^129478451 is an apocalyptic number.

129478451 is a deficient number, since it is larger than the sum of its proper divisors (4336573).

129478451 is a wasteful number, since it uses less digits than its factorization.

129478451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28101.

The product of its digits is 80640, while the sum is 41.

The square root of 129478451 is about 11378.8598286472. The cubic root of 129478451 is about 505.9013422927.

The spelling of 129478451 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, four hundred fifty-one".