18934493 has 4 divisors (see below), whose sum is σ = 19201248. Its totient is φ = 18667740.

The previous prime is 18934471. The next prime is 18934501. The reversal of 18934493 is 39443981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39443981 = 19 ⋅2075999.

It is a cyclic number.

It is not a de Polignac number, because 18934493 - 2¹⁰ = 18933469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18934493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18934423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133271 + ... + 133412.

It is an arithmetic number, because the mean of its divisors is an integer number (4800312).

Almost surely, 2^18934493 is an apocalyptic number.

It is an amenable number.

18934493 is a deficient number, since it is larger than the sum of its proper divisors (266755).

18934493 is an equidigital number, since it uses as much as digits as its factorization.

18934493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266754.

The product of its digits is 93312, while the sum is 41.

The square root of 18934493 is about 4351.3782873935. The cubic root of 18934493 is about 266.5331468732.

The spelling of 18934493 in words is "eighteen million, nine hundred thirty-four thousand, four hundred ninety-three".