127665 has 12 divisors (see below), whose sum is σ = 221364. Its totient is φ = 68064.

The previous prime is 127663. The next prime is 127669. The reversal of 127665 is 566721.

It can be written as a sum of positive squares in 2 ways, for example, as 20736 + 106929 = 144^2 + 327^2 .

It is not a de Polignac number, because 127665 - 2¹ = 127663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (18447).

2¹²⁷⁶⁶⁵ is an apocalyptic number.

127665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

127665 is a deficient number, since it is larger than the sum of its proper divisors (93699).

127665 is a wasteful number, since it uses less digits than its factorization.

127665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848 (or 2845 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 127665 is about 357.3023929391. The cubic root of 127665 is about 50.3528375892.

The spelling of 127665 in words is "one hundred twenty-seven thousand, six hundred sixty-five".