18873385 has 4 divisors (see below), whose sum is σ = 22648068. Its totient is φ = 15098704.

The previous prime is 18873331. The next prime is 18873419. The reversal of 18873385 is 58337881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 8219689 = 3264^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 18873385 - 2¹¹ = 18871337 is a prime.

It is a super-2 number, since 2×18873385² = 712409322716450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887334 + ... + 1887343.

It is an arithmetic number, because the mean of its divisors is an integer number (5662017).

Almost surely, 2^18873385 is an apocalyptic number.

It is an amenable number.

18873385 is a deficient number, since it is larger than the sum of its proper divisors (3774683).

18873385 is an equidigital number, since it uses as much as digits as its factorization.

18873385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774682.

The product of its digits is 161280, while the sum is 43.

The square root of 18873385 is about 4344.3509296557. The cubic root of 18873385 is about 266.2461070500.

The spelling of 18873385 in words is "eighteen million, eight hundred seventy-three thousand, three hundred eighty-five".