129645047 has 8 divisors (see below), whose sum is σ = 148377600. Its totient is φ = 110965464.

The previous prime is 129645031. The next prime is 129645053. The reversal of 129645047 is 740546921.

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 129645047 - 2⁴ = 129645031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129645047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129645097) 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, 7847 + ... + 17912.

It is an arithmetic number, because the mean of its divisors is an integer number (18547200).

Almost surely, 2^129645047 is an apocalyptic number.

129645047 is a deficient number, since it is larger than the sum of its proper divisors (18732553).

129645047 is an equidigital number, since it uses as much as digits as its factorization.

129645047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26485.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 129645047 is about 11386.1778925151. The cubic root of 129645047 is about 506.1182252768.

The spelling of 129645047 in words is "one hundred twenty-nine million, six hundred forty-five thousand, forty-seven".