19740653 has 2 divisors, whose sum is σ = 19740654. Its totient is φ = 19740652.

The previous prime is 19740649. The next prime is 19740661. The reversal of 19740653 is 35604791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19333609 + 407044 = 4397^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 19740653 - 2² = 19740649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19740353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870326 + 9870327.

It is an arithmetic number, because the mean of its divisors is an integer number (9870327).

Almost surely, 2^19740653 is an apocalyptic number.

It is an amenable number.

19740653 is a deficient number, since it is larger than the sum of its proper divisors (1).

19740653 is an equidigital number, since it uses as much as digits as its factorization.

19740653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 19740653 is about 4443.0454645434. The cubic root of 19740653 is about 270.2633598602.

The spelling of 19740653 in words is "nineteen million, seven hundred forty thousand, six hundred fifty-three".