18927241 has 2 divisors, whose sum is σ = 18927242. Its totient is φ = 18927240.

The previous prime is 18927203. The next prime is 18927247. The reversal of 18927241 is 14272981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 992016 = 4235^2 + 996^2 .

It is an emirp because it is prime and its reverse (14272981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18927241 - 2⁷ = 18927113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18927197 and 18927206.

It is not a weakly prime, because it can be changed into another prime (18927247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9463620 + 9463621.

It is an arithmetic number, because the mean of its divisors is an integer number (9463621).

Almost surely, 2^18927241 is an apocalyptic number.

It is an amenable number.

18927241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18927241 is an equidigital number, since it uses as much as digits as its factorization.

18927241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 18927241 is about 4350.5449083994. The cubic root of 18927241 is about 266.4991147111.

The spelling of 18927241 in words is "eighteen million, nine hundred twenty-seven thousand, two hundred forty-one".