306823 has 4 divisors (see below), whose sum is σ = 334728. Its totient is φ = 278920.

The previous prime is 306821. The next prime is 306827. The reversal of 306823 is 328603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328603 = 11 ⋅29873.

It is a cyclic number.

It is not a de Polignac number, because 306823 - 2¹ = 306821 is a prime.

It is a Duffinian number.

306823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 306794 and 306803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306821) 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, 13936 + ... + 13957.

It is an arithmetic number, because the mean of its divisors is an integer number (83682).

2³⁰⁶⁸²³ is an apocalyptic number.

306823 is a deficient number, since it is larger than the sum of its proper divisors (27905).

306823 is a wasteful number, since it uses less digits than its factorization.

306823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27904.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 306823 is about 553.9160586226. The cubic root of 306823 is about 67.4470000056.

The spelling of 306823 in words is "three hundred six thousand, eight hundred twenty-three".