427987 has 4 divisors (see below), whose sum is σ = 489136. Its totient is φ = 366840.

The previous prime is 427969. The next prime is 427991. The reversal of 427987 is 789724.

It is a happy number.

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 427987 - 2⁷ = 427859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30564 + ... + 30577.

It is an arithmetic number, because the mean of its divisors is an integer number (122284).

2⁴²⁷⁹⁸⁷ is an apocalyptic number.

427987 is a deficient number, since it is larger than the sum of its proper divisors (61149).

427987 is an equidigital number, since it uses as much as digits as its factorization.

427987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61148.

The product of its digits is 28224, while the sum is 37.

The square root of 427987 is about 654.2071537365. The cubic root of 427987 is about 75.3604574232.

It can be divided in two parts, 4279 and 87, that multiplied together give a palindrome (372273).

The spelling of 427987 in words is "four hundred twenty-seven thousand, nine hundred eighty-seven".