129127755 has 16 divisors (see below), whose sum is σ = 206933760. Its totient is φ = 68758368.

The previous prime is 129127657. The next prime is 129127763. The reversal of 129127755 is 557721921.

It is a happy number.

It is not a de Polignac number, because 129127755 - 2⁷ = 129127627 is a prime.

It is a super-2 number, since 2×129127755² = 33347954222680050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3354 + ... + 16416.

It is an arithmetic number, because the mean of its divisors is an integer number (12933360).

Almost surely, 2^129127755 is an apocalyptic number.

129127755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129127755 is a deficient number, since it is larger than the sum of its proper divisors (77806005).

129127755 is a wasteful number, since it uses less digits than its factorization.

129127755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13730.

The product of its digits is 44100, while the sum is 39.

The square root of 129127755 is about 11363.4394001112. The cubic root of 129127755 is about 505.4441799943. Note that the first 3 decimals are identical.

The spelling of 129127755 in words is "one hundred twenty-nine million, one hundred twenty-seven thousand, seven hundred fifty-five".