18371943 has 12 divisors (see below), whose sum is σ = 27254968. Its totient is φ = 11916720.

The previous prime is 18371923. The next prime is 18371953. The reversal of 18371943 is 34917381.

It is a happy number.

It is not a de Polignac number, because 18371943 - 2¹² = 18367847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18371898 and 18371907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18371923) 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, 27253 + ... + 27918.

Almost surely, 2^18371943 is an apocalyptic number.

18371943 is a deficient number, since it is larger than the sum of its proper divisors (8883025).

18371943 is a wasteful number, since it uses less digits than its factorization.

18371943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55214 (or 55211 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18371943 is about 4286.2504593176. The cubic root of 18371943 is about 263.8669698228.

The spelling of 18371943 in words is "eighteen million, three hundred seventy-one thousand, nine hundred forty-three".