18809941 has 2 divisors, whose sum is σ = 18809942. Its totient is φ = 18809940.

The previous prime is 18809891. The next prime is 18809969. The reversal of 18809941 is 14990881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 5193841 = 3690^2 + 2279^2 .

It is an emirp because it is prime and its reverse (14990881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18809941 - 2¹³ = 18801749 is a prime.

It is equal to p_1199695 and since 18809941 and 1199695 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18809894 and 18809903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18809971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404970 + 9404971.

It is an arithmetic number, because the mean of its divisors is an integer number (9404971).

Almost surely, 2^18809941 is an apocalyptic number.

It is an amenable number.

18809941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18809941 is an equidigital number, since it uses as much as digits as its factorization.

18809941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18809941 is about 4337.0428865761. The cubic root of 18809941 is about 265.9474381229.

The spelling of 18809941 in words is "eighteen million, eight hundred nine thousand, nine hundred forty-one".