19681449 has 8 divisors (see below), whose sum is σ = 26269152. Its totient is φ = 13107360.

The previous prime is 19681433. The next prime is 19681469. The reversal of 19681449 is 94418691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19681449 - 2⁴ = 19681433 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19681449.

It is not an unprimeable number, because it can be changed into a prime (19681429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669 + ... + 6309.

It is an arithmetic number, because the mean of its divisors is an integer number (3283644).

Almost surely, 2^19681449 is an apocalyptic number.

It is an amenable number.

19681449 is a deficient number, since it is larger than the sum of its proper divisors (6587703).

19681449 is a wasteful number, since it uses less digits than its factorization.

19681449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807.

The product of its digits is 62208, while the sum is 42.

The square root of 19681449 is about 4436.3779144703. The cubic root of 19681449 is about 269.9929079070.

The spelling of 19681449 in words is "nineteen million, six hundred eighty-one thousand, four hundred forty-nine".