18685893 has 4 divisors (see below), whose sum is σ = 24914528. Its totient is φ = 12457260.

The previous prime is 18685871. The next prime is 18685957. The reversal of 18685893 is 39858681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18685893 - 2¹² = 18681797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3114313 + ... + 3114318.

It is an arithmetic number, because the mean of its divisors is an integer number (6228632).

Almost surely, 2^18685893 is an apocalyptic number.

It is an amenable number.

18685893 is a deficient number, since it is larger than the sum of its proper divisors (6228635).

18685893 is an equidigital number, since it uses as much as digits as its factorization.

18685893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228634.

The product of its digits is 414720, while the sum is 48.

The square root of 18685893 is about 4322.7182420324. The cubic root of 18685893 is about 265.3615238952.

The spelling of 18685893 in words is "eighteen million, six hundred eighty-five thousand, eight hundred ninety-three".