18744841 has 2 divisors, whose sum is σ = 18744842. Its totient is φ = 18744840.

The previous prime is 18744833. The next prime is 18744851. The reversal of 18744841 is 14844781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17673616 + 1071225 = 4204^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 18744841 - 2³ = 18744833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18744841.

It is not a weakly prime, because it can be changed into another prime (18744851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372420 + 9372421.

It is an arithmetic number, because the mean of its divisors is an integer number (9372421).

Almost surely, 2^18744841 is an apocalyptic number.

It is an amenable number.

18744841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744841 is an equidigital number, since it uses as much as digits as its factorization.

18744841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 37.

The square root of 18744841 is about 4329.5312679319. The cubic root of 18744841 is about 265.6402744803.

It can be divided in two parts, 187448 and 41, that added together give a square (187489 = 433²).

The spelling of 18744841 in words is "eighteen million, seven hundred forty-four thousand, eight hundred forty-one".