127685 has 4 divisors (see below), whose sum is σ = 153228. Its totient is φ = 102144.

The previous prime is 127681. The next prime is 127691. The reversal of 127685 is 586721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586721 = 17 ⋅34513.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 36481 = 302^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 127685 - 2² = 127681 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹¹ + 6⁶ + 7³ + 8³ + 5⁷ .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12764 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (38307).

2¹²⁷⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

127685 is a deficient number, since it is larger than the sum of its proper divisors (25543).

127685 is an equidigital number, since it uses as much as digits as its factorization.

127685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25542.

The product of its digits is 3360, while the sum is 29.

The square root of 127685 is about 357.3303793410. The cubic root of 127685 is about 50.3554668772.

The spelling of 127685 in words is "one hundred twenty-seven thousand, six hundred eighty-five".