18416473 has 2 divisors, whose sum is σ = 18416474. Its totient is φ = 18416472.

The previous prime is 18416471. The next prime is 18416483. The reversal of 18416473 is 37461481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14040009 + 4376464 = 3747^2 + 2092^2 .

It is an emirp because it is prime and its reverse (37461481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18416473 - 2¹ = 18416471 is a prime.

Together with 18416471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18416471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208236 + 9208237.

It is an arithmetic number, because the mean of its divisors is an integer number (9208237).

Almost surely, 2^18416473 is an apocalyptic number.

It is an amenable number.

18416473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416473 is an equidigital number, since it uses as much as digits as its factorization.

18416473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 18416473 is about 4291.4418322983. The cubic root of 18416473 is about 264.0799851382.

The spelling of 18416473 in words is "eighteen million, four hundred sixteen thousand, four hundred seventy-three".