864213 has 12 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 493752.

The previous prime is 864211. The next prime is 864221. The reversal of 864213 is 312468.

It is a happy number.

It is not a de Polignac number, because 864213 - 2¹ = 864211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2793 + ... + 3086.

It is an arithmetic number, because the mean of its divisors is an integer number (111720).

2⁸⁶⁴²¹³ is an apocalyptic number.

It is an amenable number.

864213 is a deficient number, since it is larger than the sum of its proper divisors (476427).

864213 is a wasteful number, since it uses less digits than its factorization.

864213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896 (or 5889 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 864213 is about 929.6305717864. The cubic root of 864213 is about 95.2518892441.

The spelling of 864213 in words is "eight hundred sixty-four thousand, two hundred thirteen".