30823 has 4 divisors (see below), whose sum is σ = 33208. Its totient is φ = 28440.

The previous prime is 30817. The next prime is 30829. The reversal of 30823 is 32803.

It is a happy number.

30823 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (30817) and next prime (30829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30823 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 30797 and 30806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30829) 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, 1173 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (8302).

2³⁰⁸²³ is an apocalyptic number.

30823 is a deficient number, since it is larger than the sum of its proper divisors (2385).

30823 is a wasteful number, since it uses less digits than its factorization.

30823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30823 is about 175.5648028507. The cubic root of 30823 is about 31.3539048051.

The spelling of 30823 in words is "thirty thousand, eight hundred twenty-three".