18948641 has 2 divisors, whose sum is σ = 18948642. Its totient is φ = 18948640.

The previous prime is 18948623. The next prime is 18948647. The reversal of 18948641 is 14684981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16638241 + 2310400 = 4079^2 + 1520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18948641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18948647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474320 + 9474321.

It is an arithmetic number, because the mean of its divisors is an integer number (9474321).

Almost surely, 2^18948641 is an apocalyptic number.

It is an amenable number.

18948641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948641 is an equidigital number, since it uses as much as digits as its factorization.

18948641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 18948641 is about 4353.0036756245. The cubic root of 18948641 is about 266.5995155569.

The spelling of 18948641 in words is "eighteen million, nine hundred forty-eight thousand, six hundred forty-one".