19744469 has 2 divisors, whose sum is σ = 19744470. Its totient is φ = 19744468.

The previous prime is 19744399. The next prime is 19744471. The reversal of 19744469 is 96444791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10804369 + 8940100 = 3287^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 19744469 - 2¹⁶ = 19678933 is a prime.

It is a super-2 number, since 2×19744469² = 779688112183922, which contains 22 as substring.

Together with 19744471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19714469) 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, 9872234 + 9872235.

It is an arithmetic number, because the mean of its divisors is an integer number (9872235).

Almost surely, 2^19744469 is an apocalyptic number.

It is an amenable number.

19744469 is a deficient number, since it is larger than the sum of its proper divisors (1).

19744469 is an equidigital number, since it uses as much as digits as its factorization.

19744469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 19744469 is about 4443.4748789658. The cubic root of 19744469 is about 270.2807733087.

The spelling of 19744469 in words is "nineteen million, seven hundred forty-four thousand, four hundred sixty-nine".