18717473 has 2 divisors, whose sum is σ = 18717474. Its totient is φ = 18717472.

The previous prime is 18717467. The next prime is 18717481. The reversal of 18717473 is 37471781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 3794704 = 3863^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 18717473 - 2²⁰ = 17668897 is a prime.

It is not a weakly prime, because it can be changed into another prime (18717373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9358736 + 9358737.

It is an arithmetic number, because the mean of its divisors is an integer number (9358737).

Almost surely, 2^18717473 is an apocalyptic number.

It is an amenable number.

18717473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18717473 is an equidigital number, since it uses as much as digits as its factorization.

18717473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 38.

The square root of 18717473 is about 4326.3694941602. The cubic root of 18717473 is about 265.5109307308.

The spelling of 18717473 in words is "eighteen million, seven hundred seventeen thousand, four hundred seventy-three".