868641 has 8 divisors (see below), whose sum is σ = 1208640. Its totient is φ = 553872.

The previous prime is 868639. The next prime is 868663. The reversal of 868641 is 146868.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 868641 - 2¹ = 868639 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6226 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (151080).

2⁸⁶⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

868641 is a deficient number, since it is larger than the sum of its proper divisors (339999).

868641 is a wasteful number, since it uses less digits than its factorization.

868641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12615.

The product of its digits is 9216, while the sum is 33.

The square root of 868641 is about 932.0091201271. The cubic root of 868641 is about 95.4142940578.

The spelling of 868641 in words is "eight hundred sixty-eight thousand, six hundred forty-one".