18948653 has 2 divisors, whose sum is σ = 18948654. Its totient is φ = 18948652.

The previous prime is 18948649. The next prime is 18948679. The reversal of 18948653 is 35684981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 7912969 = 3322^2 + 2813^2 .

It is an emirp because it is prime and its reverse (35684981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18948653 - 2² = 18948649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474326 + 9474327.

It is an arithmetic number, because the mean of its divisors is an integer number (9474327).

Almost surely, 2^18948653 is an apocalyptic number.

It is an amenable number.

18948653 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948653 is an equidigital number, since it uses as much as digits as its factorization.

18948653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 18948653 is about 4353.0050539828. The cubic root of 18948653 is about 266.5995718353.

Subtracting from 18948653 its sum of digits (44), we obtain a square (18948609 = 4353²).

The spelling of 18948653 in words is "eighteen million, nine hundred forty-eight thousand, six hundred fifty-three".