19844413 has 2 divisors, whose sum is σ = 19844414. Its totient is φ = 19844412.

The previous prime is 19844411. The next prime is 19844437. The reversal of 19844413 is 31444891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 1026169 = 4338^2 + 1013^2 .

It is an emirp because it is prime and its reverse (31444891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19844413 - 2¹ = 19844411 is a prime.

Together with 19844411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19844411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9922206 + 9922207.

It is an arithmetic number, because the mean of its divisors is an integer number (9922207).

Almost surely, 2^19844413 is an apocalyptic number.

It is an amenable number.

19844413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19844413 is an equidigital number, since it uses as much as digits as its factorization.

19844413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 19844413 is about 4454.7068365943. The cubic root of 19844413 is about 270.7360483303.

The spelling of 19844413 in words is "nineteen million, eight hundred forty-four thousand, four hundred thirteen".