18315873 has 6 divisors (see below), whose sum is σ = 26456274. Its totient is φ = 12210576.

The previous prime is 18315841. The next prime is 18315877. The reversal of 18315873 is 37851381.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 1937664 = 4047^2 + 1392^2 .

It is not a de Polignac number, because 18315873 - 2⁵ = 18315841 is a prime.

It is a super-3 number, since 3×18315873³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18315877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1017540 + ... + 1017557.

It is an arithmetic number, because the mean of its divisors is an integer number (4409379).

Almost surely, 2^18315873 is an apocalyptic number.

It is an amenable number.

18315873 is a deficient number, since it is larger than the sum of its proper divisors (8140401).

18315873 is a wasteful number, since it uses less digits than its factorization.

18315873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035103 (or 2035100 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18315873 is about 4279.7047795380. The cubic root of 18315873 is about 263.5982612142.

The spelling of 18315873 in words is "eighteen million, three hundred fifteen thousand, eight hundred seventy-three".