18398473 has 4 divisors (see below), whose sum is σ = 18745668. Its totient is φ = 18051280.

The previous prime is 18398467. The next prime is 18398477. The reversal of 18398473 is 37489381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5531904 + 12866569 = 2352^2 + 3587^2 .

It is a cyclic number.

It is not a de Polignac number, because 18398473 - 2²¹ = 16301321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18398477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173518 + ... + 173623.

It is an arithmetic number, because the mean of its divisors is an integer number (4686417).

Almost surely, 2^18398473 is an apocalyptic number.

It is an amenable number.

18398473 is a deficient number, since it is larger than the sum of its proper divisors (347195).

18398473 is an equidigital number, since it uses as much as digits as its factorization.

18398473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347194.

The product of its digits is 145152, while the sum is 43.

The square root of 18398473 is about 4289.3441223572. The cubic root of 18398473 is about 263.9939210798.

The spelling of 18398473 in words is "eighteen million, three hundred ninety-eight thousand, four hundred seventy-three".