17998873 has 2 divisors, whose sum is σ = 17998874. Its totient is φ = 17998872.

The previous prime is 17998861. The next prime is 17998889. The reversal of 17998873 is 37889971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15784729 + 2214144 = 3973^2 + 1488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17998873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17998873.

It is not a weakly prime, because it can be changed into another prime (17998273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8999436 + 8999437.

It is an arithmetic number, because the mean of its divisors is an integer number (8999437).

Almost surely, 2^17998873 is an apocalyptic number.

It is an amenable number.

17998873 is a deficient number, since it is larger than the sum of its proper divisors (1).

17998873 is an equidigital number, since it uses as much as digits as its factorization.

17998873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 52.

The square root of 17998873 is about 4242.5078668165. The cubic root of 17998873 is about 262.0686697224.

The spelling of 17998873 in words is "seventeen million, nine hundred ninety-eight thousand, eight hundred seventy-three".