18443849 has 2 divisors, whose sum is σ = 18443850. Its totient is φ = 18443848.

The previous prime is 18443839. The next prime is 18443857. The reversal of 18443849 is 94834481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 7507600 = 3307^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 18443849 - 2⁴ = 18443833 is a prime.

It is not a weakly prime, because it can be changed into another prime (18443819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221924 + 9221925.

It is an arithmetic number, because the mean of its divisors is an integer number (9221925).

Almost surely, 2^18443849 is an apocalyptic number.

It is an amenable number.

18443849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443849 is an equidigital number, since it uses as much as digits as its factorization.

18443849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 18443849 is about 4294.6302518378. The cubic root of 18443849 is about 264.2107715713.

The spelling of 18443849 in words is "eighteen million, four hundred forty-three thousand, eight hundred forty-nine".