19640683 has 2 divisors, whose sum is σ = 19640684. Its totient is φ = 19640682.

The previous prime is 19640671. The next prime is 19640693. The reversal of 19640683 is 38604691.

It is a strong prime.

It is an emirp because it is prime and its reverse (38604691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19640683 - 2⁵ = 19640651 is a prime.

It is not a weakly prime, because it can be changed into another prime (19640603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9820341 + 9820342.

It is an arithmetic number, because the mean of its divisors is an integer number (9820342).

Almost surely, 2^19640683 is an apocalyptic number.

19640683 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640683 is an equidigital number, since it uses as much as digits as its factorization.

19640683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 19640683 is about 4431.7810189584. The cubic root of 19640683 is about 269.8063677987.

The spelling of 19640683 in words is "nineteen million, six hundred forty thousand, six hundred eighty-three".