18897173 has 2 divisors, whose sum is σ = 18897174. Its totient is φ = 18897172.

The previous prime is 18897161. The next prime is 18897227. The reversal of 18897173 is 37179881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 432964 = 4297^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 18897173 - 2⁴ = 18897157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18897113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448586 + 9448587.

It is an arithmetic number, because the mean of its divisors is an integer number (9448587).

Almost surely, 2^18897173 is an apocalyptic number.

It is an amenable number.

18897173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897173 is an equidigital number, since it uses as much as digits as its factorization.

18897173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The square root of 18897173 is about 4347.0878758084. The cubic root of 18897173 is about 266.3579188838.

The spelling of 18897173 in words is "eighteen million, eight hundred ninety-seven thousand, one hundred seventy-three".