18799943 has 4 divisors (see below), whose sum is σ = 19905840. Its totient is φ = 17694048.

The previous prime is 18799933. The next prime is 18799951. The reversal of 18799943 is 34999781.

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 18799943 - 2²⁰ = 17751367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18799891 and 18799900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18799903) 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, 552923 + ... + 552956.

It is an arithmetic number, because the mean of its divisors is an integer number (4976460).

Almost surely, 2^18799943 is an apocalyptic number.

18799943 is a deficient number, since it is larger than the sum of its proper divisors (1105897).

18799943 is a wasteful number, since it uses less digits than its factorization.

18799943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105896.

The product of its digits is 489888, while the sum is 50.

The square root of 18799943 is about 4335.8901046959. The cubic root of 18799943 is about 265.9003103173.

The spelling of 18799943 in words is "eighteen million, seven hundred ninety-nine thousand, nine hundred forty-three".