18993193 has 4 divisors (see below), whose sum is σ = 19819008. Its totient is φ = 18167380.

The previous prime is 18993181. The next prime is 18993203. The reversal of 18993193 is 39139981.

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 18993193 - 2⁹ = 18992681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18993113) 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, 412873 + ... + 412918.

It is an arithmetic number, because the mean of its divisors is an integer number (4954752).

Almost surely, 2^18993193 is an apocalyptic number.

It is an amenable number.

18993193 is a deficient number, since it is larger than the sum of its proper divisors (825815).

18993193 is an equidigital number, since it uses as much as digits as its factorization.

18993193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825814.

The product of its digits is 52488, while the sum is 43.

The square root of 18993193 is about 4358.1180571435. The cubic root of 18993193 is about 266.8082947326.

The spelling of 18993193 in words is "eighteen million, nine hundred ninety-three thousand, one hundred ninety-three".