127999 has 4 divisors (see below), whose sum is σ = 132160. Its totient is φ = 123840.

The previous prime is 127997. The next prime is 128021. The reversal of 127999 is 999721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127999 - 2¹ = 127997 is a prime.

It is a Duffinian number.

127999 is a modest number, since divided by 999 gives 127 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127997) 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, 2034 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (33040).

2¹²⁷⁹⁹⁹ is an apocalyptic number.

127999 is a deficient number, since it is larger than the sum of its proper divisors (4161).

127999 is an equidigital number, since it uses as much as digits as its factorization.

127999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its digits is 10206, while the sum is 37.

The square root of 127999 is about 357.7694788548. The cubic root of 127999 is about 50.3967107537.

It can be divided in two parts, 1279 and 99, that multiplied together give a palindrome (126621).

The spelling of 127999 in words is "one hundred twenty-seven thousand, nine hundred ninety-nine".