19890593 has 2 divisors, whose sum is σ = 19890594. Its totient is φ = 19890592.

The previous prime is 19890589. The next prime is 19890631. The reversal of 19890593 is 39509891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13454224 + 6436369 = 3668^2 + 2537^2 .

It is an emirp because it is prime and its reverse (39509891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19890593 - 2² = 19890589 is a prime.

It is not a weakly prime, because it can be changed into another prime (19890503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945296 + 9945297.

It is an arithmetic number, because the mean of its divisors is an integer number (9945297).

Almost surely, 2^19890593 is an apocalyptic number.

It is an amenable number.

19890593 is a deficient number, since it is larger than the sum of its proper divisors (1).

19890593 is an equidigital number, since it uses as much as digits as its factorization.

19890593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 19890593 is about 4459.8871061945. The cubic root of 19890593 is about 270.9458958906.

The spelling of 19890593 in words is "nineteen million, eight hundred ninety thousand, five hundred ninety-three".