18873943 has 12 divisors (see below), whose sum is σ = 20903344. Its totient is φ = 17028000.

The previous prime is 18873919. The next prime is 18873977. The reversal of 18873943 is 34937881.

It is a happy number.

It is not a de Polignac number, because 18873943 - 2¹³ = 18865751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18873943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17755 + ... + 18787.

Almost surely, 2^18873943 is an apocalyptic number.

18873943 is a deficient number, since it is larger than the sum of its proper divisors (2029401).

18873943 is a wasteful number, since it uses less digits than its factorization.

18873943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1195 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 18873943 is about 4344.4151505122. The cubic root of 18873943 is about 266.2487309189.

The spelling of 18873943 in words is "eighteen million, eight hundred seventy-three thousand, nine hundred forty-three".