18648373 has 2 divisors, whose sum is σ = 18648374. Its totient is φ = 18648372.

The previous prime is 18648353. The next prime is 18648401. The reversal of 18648373 is 37384681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18645124 + 3249 = 4318^2 + 57^2 .

It is an emirp because it is prime and its reverse (37384681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18648373 - 2²¹ = 16551221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18648313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324186 + 9324187.

It is an arithmetic number, because the mean of its divisors is an integer number (9324187).

Almost surely, 2^18648373 is an apocalyptic number.

It is an amenable number.

18648373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18648373 is an equidigital number, since it uses as much as digits as its factorization.

18648373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 18648373 is about 4318.3761994528. The cubic root of 18648373 is about 265.1837956000.

The spelling of 18648373 in words is "eighteen million, six hundred forty-eight thousand, three hundred seventy-three".