868989 has 16 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 495360.

The previous prime is 868957. The next prime is 868993. The reversal of 868989 is 989868.

It is not a de Polignac number, because 868989 - 2⁵ = 868957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868909) 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 15 ways as a sum of consecutive naturals, for example, 214 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁸⁶⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

868989 is a deficient number, since it is larger than the sum of its proper divisors (470211).

868989 is a wasteful number, since it uses less digits than its factorization.

868989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580.

The product of its digits is 248832, while the sum is 48.

The square root of 868989 is about 932.1957948843. The cubic root of 868989 is about 95.4270341661.

It can be divided in two parts, 8689 and 89, that added together give a palindrome (8778).

The spelling of 868989 in words is "eight hundred sixty-eight thousand, nine hundred eighty-nine".