19986385 has 16 divisors (see below), whose sum is σ = 25508160. Its totient is φ = 14990400.

The previous prime is 19986383. The next prime is 19986389. The reversal of 19986385 is 58368991.

It is not a de Polignac number, because 19986385 - 2¹ = 19986383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19986383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8554 + ... + 10636.

It is an arithmetic number, because the mean of its divisors is an integer number (1594260).

Almost surely, 2^19986385 is an apocalyptic number.

It is an amenable number.

19986385 is a deficient number, since it is larger than the sum of its proper divisors (5521775).

19986385 is a wasteful number, since it uses less digits than its factorization.

19986385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208.

The product of its digits is 466560, while the sum is 49.

The square root of 19986385 is about 4470.6134925757. The cubic root of 19986385 is about 271.3801530176.

The spelling of 19986385 in words is "nineteen million, nine hundred eighty-six thousand, three hundred eighty-five".