18774841 has 2 divisors, whose sum is σ = 18774842. Its totient is φ = 18774840.

The previous prime is 18774839. The next prime is 18774857. The reversal of 18774841 is 14847781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 319225 = 4296^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18774841 - 2¹ = 18774839 is a prime.

Together with 18774839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18774794 and 18774803.

It is not a weakly prime, because it can be changed into another prime (18774881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9387420 + 9387421.

It is an arithmetic number, because the mean of its divisors is an integer number (9387421).

Almost surely, 2^18774841 is an apocalyptic number.

It is an amenable number.

18774841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18774841 is an equidigital number, since it uses as much as digits as its factorization.

18774841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 40.

The square root of 18774841 is about 4332.9944611089. The cubic root of 18774841 is about 265.7819127511.

The spelling of 18774841 in words is "eighteen million, seven hundred seventy-four thousand, eight hundred forty-one".