19947413 has 2 divisors, whose sum is σ = 19947414. Its totient is φ = 19947412.

The previous prime is 19947407. The next prime is 19947437. The reversal of 19947413 is 31474991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 1085764 = 4343^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 19947413 - 2⁶ = 19947349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19947113) 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, 9973706 + 9973707.

It is an arithmetic number, because the mean of its divisors is an integer number (9973707).

Almost surely, 2^19947413 is an apocalyptic number.

It is an amenable number.

19947413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19947413 is an equidigital number, since it uses as much as digits as its factorization.

19947413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 19947413 is about 4466.2526798201. The cubic root of 19947413 is about 271.2036477104.

The spelling of 19947413 in words is "nineteen million, nine hundred forty-seven thousand, four hundred thirteen".