127987 has 4 divisors (see below), whose sum is σ = 129096. Its totient is φ = 126880.

The previous prime is 127979. The next prime is 127997. The reversal of 127987 is 789721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 127987 - 2³ = 127979 is a prime.

It is a Duffinian number.

127987 is a lucky number.

It is a plaindrome in base 14.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (127997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358 + ... + 619.

It is an arithmetic number, because the mean of its divisors is an integer number (32274).

2¹²⁷⁹⁸⁷ is an apocalyptic number.

127987 is a deficient number, since it is larger than the sum of its proper divisors (1109).

127987 is an equidigital number, since it uses as much as digits as its factorization.

127987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108.

The product of its digits is 7056, while the sum is 34.

The square root of 127987 is about 357.7527078863. The cubic root of 127987 is about 50.3951357949.

The spelling of 127987 in words is "one hundred twenty-seven thousand, nine hundred eighty-seven".