129918265 has 16 divisors (see below), whose sum is σ = 161568000. Its totient is φ = 100219392.

The previous prime is 129918209. The next prime is 129918277. The reversal of 129918265 is 562819921.

It is a cyclic number.

It is not a de Polignac number, because 129918265 - 2¹⁹ = 129393977 is a prime.

It is a super-2 number, since 2×129918265² = 33757511161220450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

129918265 is a Rhonda number in base 10.

Its product of digits (77760) is a multiple of the sum of its prime divisors (7776).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13161 + ... + 20809.

It is an arithmetic number, because the mean of its divisors is an integer number (10098000).

Almost surely, 2^129918265 is an apocalyptic number.

It is an amenable number.

129918265 is a deficient number, since it is larger than the sum of its proper divisors (31649735).

129918265 is an equidigital number, since it uses as much as digits as its factorization.

129918265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7776.

The product of its digits is 77760, while the sum is 43.

The square root of 129918265 is about 11398.1693705612. The cubic root of 129918265 is about 506.4735122369.

The spelling of 129918265 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, two hundred sixty-five".