19965349 has 2 divisors, whose sum is σ = 19965350. Its totient is φ = 19965348.

The previous prime is 19965347. The next prime is 19965353. The reversal of 19965349 is 94356991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 9108324 = 3295^2 + 3018^2 .

It is an emirp because it is prime and its reverse (94356991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19965349 - 2¹ = 19965347 is a prime.

Together with 19965347, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19965299 and 19965308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19965347) 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, 9982674 + 9982675.

It is an arithmetic number, because the mean of its divisors is an integer number (9982675).

Almost surely, 2^19965349 is an apocalyptic number.

It is an amenable number.

19965349 is a deficient number, since it is larger than the sum of its proper divisors (1).

19965349 is an equidigital number, since it uses as much as digits as its factorization.

19965349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 46.

The square root of 19965349 is about 4468.2601759522. The cubic root of 19965349 is about 271.2849088981.

The spelling of 19965349 in words is "nineteen million, nine hundred sixty-five thousand, three hundred forty-nine".