18849985 has 24 divisors (see below), whose sum is σ = 28421568. Its totient is φ = 11748000.

The previous prime is 18849979. The next prime is 18849997. The reversal of 18849985 is 58994881.

It is not a de Polignac number, because 18849985 - 2³ = 18849977 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2010 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (1184232).

Almost surely, 2^18849985 is an apocalyptic number.

It is an amenable number.

18849985 is a deficient number, since it is larger than the sum of its proper divisors (9571583).

18849985 is a wasteful number, since it uses less digits than its factorization.

18849985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4485 (or 4474 counting only the distinct ones).

The product of its digits is 829440, while the sum is 52.

The square root of 18849985 is about 4341.6569417677. The cubic root of 18849985 is about 266.1360272474.

Subtracting 18849985 from its reverse (58994881), we obtain a square (40144896 = 6336²).

The spelling of 18849985 in words is "eighteen million, eight hundred forty-nine thousand, nine hundred eighty-five".