18825841 has 2 divisors, whose sum is σ = 18825842. Its totient is φ = 18825840.

The previous prime is 18825839. The next prime is 18825869. The reversal of 18825841 is 14852881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 848241 = 4240^2 + 921^2 .

It is an emirp because it is prime and its reverse (14852881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18825841 - 2¹ = 18825839 is a prime.

Together with 18825839, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18825841.

It is not a weakly prime, because it can be changed into another prime (18825871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9412920 + 9412921.

It is an arithmetic number, because the mean of its divisors is an integer number (9412921).

Almost surely, 2^18825841 is an apocalyptic number.

It is an amenable number.

18825841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18825841 is an equidigital number, since it uses as much as digits as its factorization.

18825841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20480, while the sum is 37.

The square root of 18825841 is about 4338.8755455763. The cubic root of 18825841 is about 266.0223519386.

The spelling of 18825841 in words is "eighteen million, eight hundred twenty-five thousand, eight hundred forty-one".