18913841 has 2 divisors, whose sum is σ = 18913842. Its totient is φ = 18913840.

The previous prime is 18913823. The next prime is 18913847. The reversal of 18913841 is 14831981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 672400 = 4271^2 + 820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18913841 is a prime.

It is not a weakly prime, because it can be changed into another prime (18913847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456920 + 9456921.

It is an arithmetic number, because the mean of its divisors is an integer number (9456921).

Almost surely, 2^18913841 is an apocalyptic number.

It is an amenable number.

18913841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18913841 is an equidigital number, since it uses as much as digits as its factorization.

18913841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 18913841 is about 4349.0045987559. The cubic root of 18913841 is about 266.4362083563.

The spelling of 18913841 in words is "eighteen million, nine hundred thirteen thousand, eight hundred forty-one".