30993223 has 4 divisors (see below), whose sum is σ = 31022280. Its totient is φ = 30964168.

The previous prime is 30993139. The next prime is 30993251. The reversal of 30993223 is 32239903.

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

It is a cyclic number.

It is not a de Polignac number, because 30993223 - 2²¹ = 28896071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30993623) 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, 12865 + ... + 15082.

It is an arithmetic number, because the mean of its divisors is an integer number (7755570).

Almost surely, 2^30993223 is an apocalyptic number.

30993223 is a deficient number, since it is larger than the sum of its proper divisors (29057).

30993223 is a wasteful number, since it uses less digits than its factorization.

30993223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29056.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 30993223 is about 5567.1557369989. The cubic root of 30993223 is about 314.1151720260.

The spelling of 30993223 in words is "thirty million, nine hundred ninety-three thousand, two hundred twenty-three".