18444943 has 4 divisors (see below), whose sum is σ = 20121768. Its totient is φ = 16768120.

The previous prime is 18444941. The next prime is 18444961. The reversal of 18444943 is 34944481.

It is a happy number.

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 18444943 - 2¹ = 18444941 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 (18444941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838396 + ... + 838417.

It is an arithmetic number, because the mean of its divisors is an integer number (5030442).

Almost surely, 2^18444943 is an apocalyptic number.

18444943 is a deficient number, since it is larger than the sum of its proper divisors (1676825).

18444943 is a wasteful number, since it uses less digits than its factorization.

18444943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676824.

The product of its digits is 55296, while the sum is 37.

The square root of 18444943 is about 4294.7576183063. The cubic root of 18444943 is about 264.2159953702.

The spelling of 18444943 in words is "eighteen million, four hundred forty-four thousand, nine hundred forty-three".