19640741 has 2 divisors, whose sum is σ = 19640742. Its totient is φ = 19640740.

The previous prime is 19640713. The next prime is 19640749. The reversal of 19640741 is 14704691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17048641 + 2592100 = 4129^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 19640741 - 2¹⁰ = 19639717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19640698 and 19640707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19640749) 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, 9820370 + 9820371.

It is an arithmetic number, because the mean of its divisors is an integer number (9820371).

Almost surely, 2^19640741 is an apocalyptic number.

It is an amenable number.

19640741 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640741 is an equidigital number, since it uses as much as digits as its factorization.

19640741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 19640741 is about 4431.7875625982. The cubic root of 19640741 is about 269.8066333827.

The spelling of 19640741 in words is "nineteen million, six hundred forty thousand, seven hundred forty-one".