18120943 has 4 divisors (see below), whose sum is σ = 18153360. Its totient is φ = 18088528.

The previous prime is 18120937. The next prime is 18120959. The reversal of 18120943 is 34902181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34902181 = 1091 ⋅31991.

It is a cyclic number.

It is not a de Polignac number, because 18120943 - 2¹⁷ = 17989871 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 (18120913) 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 3 ways as a sum of consecutive naturals, for example, 15355 + ... + 16492.

It is an arithmetic number, because the mean of its divisors is an integer number (4538340).

Almost surely, 2^18120943 is an apocalyptic number.

18120943 is a deficient number, since it is larger than the sum of its proper divisors (32417).

18120943 is an equidigital number, since it uses as much as digits as its factorization.

18120943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32416.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18120943 is about 4256.8700943299. The cubic root of 18120943 is about 262.6597932601.

The spelling of 18120943 in words is "eighteen million, one hundred twenty thousand, nine hundred forty-three".