868981 has 4 divisors (see below), whose sum is σ = 873964. Its totient is φ = 864000.

The previous prime is 868957. The next prime is 868993. The reversal of 868981 is 189868.

It is a happy number.

868981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 188356 + 680625 = 434^2 + 825^2 .

It is a 4-Lehmer number, since φ(868981) divides (868981-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 868981 - 2¹¹ = 866933 is a prime.

It is a super-2 number, since 2×868981² = 1510255956722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2220 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (218491).

2⁸⁶⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

868981 is a deficient number, since it is larger than the sum of its proper divisors (4983).

868981 is a wasteful number, since it uses less digits than its factorization.

868981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982.

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

The square root of 868981 is about 932.1915039304. The cubic root of 868981 is about 95.4267413282.

It can be divided in two parts, 868 and 981, that added together give a square (1849 = 43²).

The spelling of 868981 in words is "eight hundred sixty-eight thousand, nine hundred eighty-one".