18697943 has 8 divisors (see below), whose sum is σ = 21597840. Its totient is φ = 15998080.

The previous prime is 18697907. The next prime is 18697949. The reversal of 18697943 is 34979681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18697943 - 2¹⁰ = 18696919 is a prime.

It is a super-2 number, since 2×18697943² = 699226144862498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18697949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49808 + ... + 50181.

It is an arithmetic number, because the mean of its divisors is an integer number (2699730).

Almost surely, 2^18697943 is an apocalyptic number.

18697943 is a deficient number, since it is larger than the sum of its proper divisors (2899897).

18697943 is a wasteful number, since it uses less digits than its factorization.

18697943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100017.

The product of its digits is 326592, while the sum is 47.

The square root of 18697943 is about 4324.1118163156. Note that the first 3 decimals coincide. The cubic root of 18697943 is about 265.4185530002.

The spelling of 18697943 in words is "eighteen million, six hundred ninety-seven thousand, nine hundred forty-three".