19689493 has 2 divisors, whose sum is σ = 19689494. Its totient is φ = 19689492.

The previous prime is 19689479. The next prime is 19689499. The reversal of 19689493 is 39498691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15186609 + 4502884 = 3897^2 + 2122^2 .

It is a cyclic number.

It is not a de Polignac number, because 19689493 - 2¹³ = 19681301 is a prime.

It is a super-2 number, since 2×19689493² = 775352269194098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19689499) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9844746 + 9844747.

It is an arithmetic number, because the mean of its divisors is an integer number (9844747).

Almost surely, 2^19689493 is an apocalyptic number.

It is an amenable number.

19689493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19689493 is an equidigital number, since it uses as much as digits as its factorization.

19689493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 19689493 is about 4437.2844172985. The cubic root of 19689493 is about 270.0296858078.

The spelling of 19689493 in words is "nineteen million, six hundred eighty-nine thousand, four hundred ninety-three".