129186973 has 4 divisors (see below), whose sum is σ = 131935680. Its totient is φ = 126438268.

The previous prime is 129186913. The next prime is 129186989. The reversal of 129186973 is 379681921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129186973 - 2¹³ = 129178781 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 (129186913) 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 3 ways as a sum of consecutive naturals, for example, 1374283 + ... + 1374376.

It is an arithmetic number, because the mean of its divisors is an integer number (32983920).

Almost surely, 2^129186973 is an apocalyptic number.

It is an amenable number.

129186973 is a deficient number, since it is larger than the sum of its proper divisors (2748707).

129186973 is an equidigital number, since it uses as much as digits as its factorization.

129186973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748706.

The product of its digits is 163296, while the sum is 46.

The square root of 129186973 is about 11366.0447386063. The cubic root of 129186973 is about 505.5214337680.

It can be divided in two parts, 12918 and 6973, that added together give a palindrome (19891).

The spelling of 129186973 in words is "one hundred twenty-nine million, one hundred eighty-six thousand, nine hundred seventy-three".