18842741 has 2 divisors, whose sum is σ = 18842742. Its totient is φ = 18842740.

The previous prime is 18842693. The next prime is 18842767. The reversal of 18842741 is 14724881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18309841 + 532900 = 4279^2 + 730^2 .

It is an emirp because it is prime and its reverse (14724881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18842741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18844741) 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 as a sum of consecutive naturals, namely, 9421370 + 9421371.

It is an arithmetic number, because the mean of its divisors is an integer number (9421371).

Almost surely, 2^18842741 is an apocalyptic number.

It is an amenable number.

18842741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18842741 is an equidigital number, since it uses as much as digits as its factorization.

18842741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 35.

The square root of 18842741 is about 4340.8226178917. The cubic root of 18842741 is about 266.1019310860.

It can be divided in two parts, 188 and 42741, that multiplied together give a palindrome (8035308).

The spelling of 18842741 in words is "eighteen million, eight hundred forty-two thousand, seven hundred forty-one".