868819 has 16 divisors (see below), whose sum is σ = 1080000. Its totient is φ = 696192.

The previous prime is 868817. The next prime is 868841. The reversal of 868819 is 918868.

It is a happy number.

868819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 868819 - 2¹ = 868817 is a prime.

It is a super-2 number, since 2×868819² = 1509692909522, which contains 22 as substring.

It is a Duffinian number.

868819 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5757 + ... + 5905.

It is an arithmetic number, because the mean of its divisors is an integer number (67500).

2⁸⁶⁸⁸¹⁹ is an apocalyptic number.

868819 is a deficient number, since it is larger than the sum of its proper divisors (211181).

868819 is a wasteful number, since it uses less digits than its factorization.

868819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 173 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 868819 is about 932.1046078633. The cubic root of 868819 is about 95.4208109750.

The spelling of 868819 in words is "eight hundred sixty-eight thousand, eight hundred nineteen".