18873229 has 8 divisors (see below), whose sum is σ = 19595160. Its totient is φ = 18156096.

The previous prime is 18873227. The next prime is 18873299. The reversal of 18873229 is 92237881.

It can be written as a sum of positive squares in 4 ways, for example, as 366025 + 18507204 = 605^2 + 4302^2 .

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 18873229 - 2¹ = 18873227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18873191 and 18873200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8167 + ... + 10219.

It is an arithmetic number, because the mean of its divisors is an integer number (2449395).

Almost surely, 2^18873229 is an apocalyptic number.

It is an amenable number.

18873229 is a deficient number, since it is larger than the sum of its proper divisors (721931).

18873229 is a wasteful number, since it uses less digits than its factorization.

18873229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399.

The product of its digits is 48384, while the sum is 40.

The square root of 18873229 is about 4344.3329752679. The cubic root of 18873229 is about 266.2453734860.

The spelling of 18873229 in words is "eighteen million, eight hundred seventy-three thousand, two hundred twenty-nine".