818213 has 4 divisors (see below), whose sum is σ = 892608. Its totient is φ = 743820.

The previous prime is 818189. The next prime is 818219. The reversal of 818213 is 312818.

818213 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 818213 - 2¹⁸ = 556069 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818219) 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, 37181 + ... + 37202.

It is an arithmetic number, because the mean of its divisors is an integer number (223152).

2⁸¹⁸²¹³ is an apocalyptic number.

It is an amenable number.

818213 is a deficient number, since it is larger than the sum of its proper divisors (74395).

818213 is a wasteful number, since it uses less digits than its factorization.

818213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74394.

The product of its digits is 384, while the sum is 23.

The square root of 818213 is about 904.5512699676. The cubic root of 818213 is about 93.5309743242.

The spelling of 818213 in words is "eight hundred eighteen thousand, two hundred thirteen".