889987 has 12 divisors (see below), whose sum is σ = 1062936. Its totient is φ = 742560.

The previous prime is 889963. The next prime is 889997. The reversal of 889987 is 789988.

It is not a de Polignac number, because 889987 - 2¹⁹ = 365699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 889987.

It is not an unprimeable number, because it can be changed into a prime (889907) 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, 1788 + ... + 2230.

It is an arithmetic number, because the mean of its divisors is an integer number (88578).

2⁸⁸⁹⁹⁸⁷ is an apocalyptic number.

889987 is a deficient number, since it is larger than the sum of its proper divisors (172949).

889987 is a wasteful number, since it uses less digits than its factorization.

889987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 491 counting only the distinct ones).

The product of its digits is 290304, while the sum is 49.

The square root of 889987 is about 943.3912231943. The cubic root of 889987 is about 96.1895488176.

Subtracting from 889987 its reverse (789988), we obtain a palindrome (99999).

The spelling of 889987 in words is "eight hundred eighty-nine thousand, nine hundred eighty-seven".