18172873 has 8 divisors (see below), whose sum is σ = 19171520. Its totient is φ = 17178480.

The previous prime is 18172871. The next prime is 18172877. The reversal of 18172873 is 37827181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18172873 - 2¹ = 18172871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18172871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11836 + ... + 13282.

It is an arithmetic number, because the mean of its divisors is an integer number (2396440).

Almost surely, 2^18172873 is an apocalyptic number.

It is an amenable number.

18172873 is a deficient number, since it is larger than the sum of its proper divisors (998647).

18172873 is a wasteful number, since it uses less digits than its factorization.

18172873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127.

The product of its digits is 18816, while the sum is 37.

The square root of 18172873 is about 4262.9652825234. The cubic root of 18172873 is about 262.9104592851.

The spelling of 18172873 in words is "eighteen million, one hundred seventy-two thousand, eight hundred seventy-three".