19985449 has 12 divisors (see below), whose sum is σ = 22078000. Its totient is φ = 18077400.

The previous prime is 19985447. The next prime is 19985461. The reversal of 19985449 is 94458991.

It is a happy number.

It is not a de Polignac number, because 19985449 - 2¹ = 19985447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19985443) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 39802 + ... + 40300.

Almost surely, 2^19985449 is an apocalyptic number.

It is an amenable number.

19985449 is a deficient number, since it is larger than the sum of its proper divisors (2092551).

19985449 is a wasteful number, since it uses less digits than its factorization.

19985449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 841 counting only the distinct ones).

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

The square root of 19985449 is about 4470.5088077309. The cubic root of 19985449 is about 271.3759165371.

It can be divided in two parts, 1998 and 5449, that added together give a palindrome (7447).

The spelling of 19985449 in words is "nineteen million, nine hundred eighty-five thousand, four hundred forty-nine".