19489493 has 2 divisors, whose sum is σ = 19489494. Its totient is φ = 19489492.

The previous prime is 19489489. The next prime is 19489501. The reversal of 19489493 is 39498491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14190289 + 5299204 = 3767^2 + 2302^2 .

It is an emirp because it is prime and its reverse (39498491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19489493 - 2² = 19489489 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19489403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9744746 + 9744747.

It is an arithmetic number, because the mean of its divisors is an integer number (9744747).

Almost surely, 2^19489493 is an apocalyptic number.

It is an amenable number.

19489493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19489493 is an equidigital number, since it uses as much as digits as its factorization.

19489493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 19489493 is about 4414.6905893845. The cubic root of 19489493 is about 269.1122788293.

The spelling of 19489493 in words is "nineteen million, four hundred eighty-nine thousand, four hundred ninety-three".