868521 has 16 divisors (see below), whose sum is σ = 1224000. Its totient is φ = 547008.

The previous prime is 868493. The next prime is 868529. The reversal of 868521 is 125868.

It is not a de Polignac number, because 868521 - 2⁵ = 868489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (868529) 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, 5755 + ... + 5903.

It is an arithmetic number, because the mean of its divisors is an integer number (76500).

2⁸⁶⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

868521 is a deficient number, since it is larger than the sum of its proper divisors (355479).

868521 is a wasteful number, since it uses less digits than its factorization.

868521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248.

The product of its digits is 3840, while the sum is 30.

The square root of 868521 is about 931.9447408511. The cubic root of 868521 is about 95.4099001280.

The spelling of 868521 in words is "eight hundred sixty-eight thousand, five hundred twenty-one".