18945382 has 4 divisors (see below), whose sum is σ = 28418076. Its totient is φ = 9472690.

The previous prime is 18945379. The next prime is 18945383. The reversal of 18945382 is 28354981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28354981 = 193 ⋅146917.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4736344 + ... + 4736347.

It is an arithmetic number, because the mean of its divisors is an integer number (7104519).

Almost surely, 2^18945382 is an apocalyptic number.

18945382 is a deficient number, since it is larger than the sum of its proper divisors (9472694).

18945382 is an equidigital number, since it uses as much as digits as its factorization.

18945382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472693.

The product of its digits is 69120, while the sum is 40.

The square root of 18945382 is about 4352.6293203074. The cubic root of 18945382 is about 266.5842304214.

The spelling of 18945382 in words is "eighteen million, nine hundred forty-five thousand, three hundred eighty-two".