30993 has 4 divisors (see below), whose sum is σ = 41328. Its totient is φ = 20660.

The previous prime is 30983. The next prime is 31013. The reversal of 30993 is 39903.

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 30993 - 2⁴ = 30977 is a prime.

It is a D-number.

It is a Curzon number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (30983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5163 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (10332).

2³⁰⁹⁹³ is an apocalyptic number.

It is an amenable number.

30993 is a deficient number, since it is larger than the sum of its proper divisors (10335).

30993 is a wasteful number, since it uses less digits than its factorization.

30993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10334.

The product of its (nonzero) digits is 729, while the sum is 24.

The square root of 30993 is about 176.0482888301. The cubic root of 30993 is about 31.4114418659.

The spelling of 30993 in words is "thirty thousand, nine hundred ninety-three".