7823213 has 4 divisors (see below), whose sum is σ = 8283420. Its totient is φ = 7363008.

The previous prime is 7823203. The next prime is 7823219. The reversal of 7823213 is 3123287.

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 6086089 + 1737124 = 2467^2 + 1318^2 .

It is a cyclic number.

It is not a de Polignac number, because 7823213 - 2¹⁰ = 7822189 is a prime.

It is a super-2 number, since 2×7823213² = 122405323286738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7823219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230078 + ... + 230111.

It is an arithmetic number, because the mean of its divisors is an integer number (2070855).

Almost surely, 2^7823213 is an apocalyptic number.

It is an amenable number.

7823213 is a deficient number, since it is larger than the sum of its proper divisors (460207).

7823213 is a wasteful number, since it uses less digits than its factorization.

7823213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460206.

The product of its digits is 2016, while the sum is 26.

The square root of 7823213 is about 2797.0007150517. Note that the first 3 decimals coincide. The cubic root of 7823213 is about 198.5157878172.

The spelling of 7823213 in words is "seven million, eight hundred twenty-three thousand, two hundred thirteen".