18873231 has 8 divisors (see below), whose sum is σ = 27100080. Its totient is φ = 11614272.

The previous prime is 18873227. The next prime is 18873299. The reversal of 18873231 is 13237881.

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

It is not a de Polignac number, because 18873231 - 2² = 18873227 is a prime.

It is a super-2 number, since 2×18873231² = 712397696758722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18873192 and 18873201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873131) 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, 241926 + ... + 242003.

It is an arithmetic number, because the mean of its divisors is an integer number (3387510).

Almost surely, 2^18873231 is an apocalyptic number.

18873231 is a deficient number, since it is larger than the sum of its proper divisors (8226849).

18873231 is a wasteful number, since it uses less digits than its factorization.

18873231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483945.

The product of its digits is 8064, while the sum is 33.

The square root of 18873231 is about 4344.3332054528. Note that the first 3 decimals coincide. The cubic root of 18873231 is about 266.2453828907.

The spelling of 18873231 in words is "eighteen million, eight hundred seventy-three thousand, two hundred thirty-one".