18443941 has 4 divisors (see below), whose sum is σ = 18477612. Its totient is φ = 18410272.

The previous prime is 18443933. The next prime is 18443951. The reversal of 18443941 is 14934481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14934481 = 191 ⋅78191.

It can be written as a sum of positive squares in 2 ways, for example, as 2873025 + 15570916 = 1695^2 + 3946^2 .

It is a cyclic number.

It is not a de Polignac number, because 18443941 - 2³ = 18443933 is a prime.

It is a super-2 number, since 2×18443941² = 680357919222962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18443897 and 18443906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443951) 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, 16000 + ... + 17113.

It is an arithmetic number, because the mean of its divisors is an integer number (4619403).

Almost surely, 2^18443941 is an apocalyptic number.

It is an amenable number.

18443941 is a deficient number, since it is larger than the sum of its proper divisors (33671).

18443941 is an equidigital number, since it uses as much as digits as its factorization.

18443941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33670.

The product of its digits is 13824, while the sum is 34.

The square root of 18443941 is about 4294.6409628745. The cubic root of 18443941 is about 264.2112108750.

The spelling of 18443941 in words is "eighteen million, four hundred forty-three thousand, nine hundred forty-one".