19449449 has 2 divisors, whose sum is σ = 19449450. Its totient is φ = 19449448.

The previous prime is 19449433. The next prime is 19449461. The reversal of 19449449 is 94494491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 3489424 = 3995^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 19449449 - 2⁴ = 19449433 is a prime.

It is not a weakly prime, because it can be changed into another prime (19449499) 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 as a sum of consecutive naturals, namely, 9724724 + 9724725.

It is an arithmetic number, because the mean of its divisors is an integer number (9724725).

Almost surely, 2^19449449 is an apocalyptic number.

It is an amenable number.

19449449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19449449 is an equidigital number, since it uses as much as digits as its factorization.

19449449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 19449449 is about 4410.1529451936. The cubic root of 19449449 is about 268.9278423393.

The spelling of 19449449 in words is "nineteen million, four hundred forty-nine thousand, four hundred forty-nine".