19967449 has 2 divisors, whose sum is σ = 19967450. Its totient is φ = 19967448.

The previous prime is 19967447. The next prime is 19967459. The reversal of 19967449 is 94476991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18429849 + 1537600 = 4293^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 19967449 - 2¹ = 19967447 is a prime.

Together with 19967447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19967443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9983724 + 9983725.

It is an arithmetic number, because the mean of its divisors is an integer number (9983725).

Almost surely, 2^19967449 is an apocalyptic number.

It is an amenable number.

19967449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19967449 is an equidigital number, since it uses as much as digits as its factorization.

19967449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 19967449 is about 4468.4951605658. The cubic root of 19967449 is about 271.2944200155.

The spelling of 19967449 in words is "nineteen million, nine hundred sixty-seven thousand, four hundred forty-nine".