18236943 has 6 divisors (see below), whose sum is σ = 26342264. Its totient is φ = 12157956.

The previous prime is 18236927. The next prime is 18236947. The reversal of 18236943 is 34963281.

It is not a de Polignac number, because 18236943 - 2⁴ = 18236927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18236898 and 18236907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1013155 + ... + 1013172.

Almost surely, 2^18236943 is an apocalyptic number.

18236943 is a deficient number, since it is larger than the sum of its proper divisors (8105321).

18236943 is a wasteful number, since it uses less digits than its factorization.

18236943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026333 (or 2026330 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 18236943 is about 4270.4733929624. The cubic root of 18236943 is about 263.2190679099.

The spelling of 18236943 in words is "eighteen million, two hundred thirty-six thousand, nine hundred forty-three".