18765473 has 2 divisors, whose sum is σ = 18765474. Its totient is φ = 18765472.

The previous prime is 18765463. The next prime is 18765479. The reversal of 18765473 is 37456781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 506944 = 4273^2 + 712^2 .

It is an emirp because it is prime and its reverse (37456781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18765473 - 2²⁴ = 1988257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18765473.

It is not a weakly prime, because it can be changed into another prime (18765479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9382736 + 9382737.

It is an arithmetic number, because the mean of its divisors is an integer number (9382737).

Almost surely, 2^18765473 is an apocalyptic number.

It is an amenable number.

18765473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18765473 is an equidigital number, since it uses as much as digits as its factorization.

18765473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 18765473 is about 4331.9133186157. The cubic root of 18765473 is about 265.7377000520.

The spelling of 18765473 in words is "eighteen million, seven hundred sixty-five thousand, four hundred seventy-three".