19966449 has 32 divisors (see below), whose sum is σ = 29666304. Its totient is φ = 11888640.

The previous prime is 19966439. The next prime is 19966477. The reversal of 19966449 is 94466991.

It is not a de Polignac number, because 19966449 - 2⁹ = 19965937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19966398 and 19966407.

It is not an unprimeable number, because it can be changed into a prime (19966439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115327 + ... + 115499.

It is an arithmetic number, because the mean of its divisors is an integer number (927072).

Almost surely, 2^19966449 is an apocalyptic number.

It is an amenable number.

19966449 is a deficient number, since it is larger than the sum of its proper divisors (9699855).

19966449 is a wasteful number, since it uses less digits than its factorization.

19966449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its digits is 419904, while the sum is 48.

The square root of 19966449 is about 4468.3832646719. The cubic root of 19966449 is about 271.2898909952.

The spelling of 19966449 in words is "nineteen million, nine hundred sixty-six thousand, four hundred forty-nine".