30812 has 6 divisors (see below), whose sum is σ = 53928. Its totient is φ = 15404.

The previous prime is 30809. The next prime is 30817. The reversal of 30812 is 21803.

It is a plaindrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3848 + ... + 3855.

It is an arithmetic number, because the mean of its divisors is an integer number (8988).

2³⁰⁸¹² is an apocalyptic number.

It is an amenable number.

30812 is a deficient number, since it is larger than the sum of its proper divisors (23116).

30812 is a wasteful number, since it uses less digits than its factorization.

30812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7707 (or 7705 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 30812 is about 175.5334725914. The cubic root of 30812 is about 31.3501745389.

Subtracting from 30812 its reverse (21803), we obtain a palindrome (9009).

The spelling of 30812 in words is "thirty thousand, eight hundred twelve".