306213 has 4 divisors (see below), whose sum is σ = 408288. Its totient is φ = 204140.

The previous prime is 306209. The next prime is 306239. The reversal of 306213 is 312603.

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 a cyclic number.

It is not a de Polignac number, because 306213 - 2² = 306209 is a prime.

It is a d-powerful number, because it can be written as 3⁸ + 0 + 2⁵ + 6⁷ + 1 + 3⁹ .

It is a D-number.

306213 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 306192 and 306201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306253) 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, 51033 + ... + 51038.

It is an arithmetic number, because the mean of its divisors is an integer number (102072).

2³⁰⁶²¹³ is an apocalyptic number.

It is an amenable number.

306213 is a deficient number, since it is larger than the sum of its proper divisors (102075).

306213 is a wasteful number, since it uses less digits than its factorization.

306213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102074.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 306213 is about 553.3651597273. The cubic root of 306213 is about 67.4022728441.

Adding to 306213 its reverse (312603), we get a palindrome (618816).

The spelling of 306213 in words is "three hundred six thousand, two hundred thirteen".