129383887 has 4 divisors (see below), whose sum is σ = 130040856. Its totient is φ = 128726920.

The previous prime is 129383879. The next prime is 129383899. The reversal of 129383887 is 788383921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129383887 - 2³ = 129383879 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129383887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129387887) 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 3 ways as a sum of consecutive naturals, for example, 328189 + ... + 328582.

It is an arithmetic number, because the mean of its divisors is an integer number (32510214).

Almost surely, 2^129383887 is an apocalyptic number.

129383887 is a deficient number, since it is larger than the sum of its proper divisors (656969).

129383887 is an equidigital number, since it uses as much as digits as its factorization.

129383887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656968.

The product of its digits is 580608, while the sum is 49.

The square root of 129383887 is about 11374.7038203199. The cubic root of 129383887 is about 505.7781513795.

The spelling of 129383887 in words is "one hundred twenty-nine million, three hundred eighty-three thousand, eight hundred eighty-seven".