129386169 has 24 divisors (see below), whose sum is σ = 204650784. Its totient is φ = 78120000.

The previous prime is 129386111. The next prime is 129386177. The reversal of 129386169 is 961683921.

It is a happy number.

129386169 is a `hidden beast` number, since 1 + 29 + 3 + 8 + 616 + 9 = 666.

It is not a de Polignac number, because 129386169 - 2⁸ = 129385913 is a prime.

It is a super-2 number, since 2×129386169² = 33481561456993122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129386189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25494 + ... + 30144.

It is an arithmetic number, because the mean of its divisors is an integer number (8527116).

Almost surely, 2^129386169 is an apocalyptic number.

It is an amenable number.

129386169 is a deficient number, since it is larger than the sum of its proper divisors (75264615).

129386169 is a wasteful number, since it uses less digits than its factorization.

129386169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949 (or 4946 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 129386169 is about 11374.8041301818. The cubic root of 129386169 is about 505.7811249052.

The spelling of 129386169 in words is "one hundred twenty-nine million, three hundred eighty-six thousand, one hundred sixty-nine".