129378805 has 8 divisors (see below), whose sum is σ = 156208032. Its totient is φ = 102867408.

The previous prime is 129378803. The next prime is 129378811. The reversal of 129378805 is 508873921.

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 129378805 - 2¹ = 129378803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129378803) 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 7 ways as a sum of consecutive naturals, for example, 78559 + ... + 80188.

It is an arithmetic number, because the mean of its divisors is an integer number (19526004).

Almost surely, 2^129378805 is an apocalyptic number.

It is an amenable number.

129378805 is a deficient number, since it is larger than the sum of its proper divisors (26829227).

129378805 is a wasteful number, since it uses less digits than its factorization.

129378805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158915.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 129378805 is about 11374.4804276943. The cubic root of 129378805 is about 505.7715292303.

The spelling of 129378805 in words is "one hundred twenty-nine million, three hundred seventy-eight thousand, eight hundred five".