18361943 has 4 divisors (see below), whose sum is σ = 18389208. Its totient is φ = 18334680.

The previous prime is 18361897. The next prime is 18361957. The reversal of 18361943 is 34916381.

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 18361943 - 2⁸ = 18361687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361963) 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, 12596 + ... + 13977.

It is an arithmetic number, because the mean of its divisors is an integer number (4597302).

Almost surely, 2^18361943 is an apocalyptic number.

18361943 is a deficient number, since it is larger than the sum of its proper divisors (27265).

18361943 is an equidigital number, since it uses as much as digits as its factorization.

18361943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27264.

The product of its digits is 15552, while the sum is 35.

The square root of 18361943 is about 4285.0837798111. The cubic root of 18361943 is about 263.8190861451.

It can be divided in two parts, 183 and 61943, that added together give a palindrome (62126).

The spelling of 18361943 in words is "eighteen million, three hundred sixty-one thousand, nine hundred forty-three".