19828649 has 2 divisors, whose sum is σ = 19828650. Its totient is φ = 19828648.

The previous prime is 19828619. The next prime is 19828657. The reversal of 19828649 is 94682891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1338649 = 4300^2 + 1157^2 .

It is an emirp because it is prime and its reverse (94682891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19828649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19828619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9914324 + 9914325.

It is an arithmetic number, because the mean of its divisors is an integer number (9914325).

Almost surely, 2^19828649 is an apocalyptic number.

It is an amenable number.

19828649 is a deficient number, since it is larger than the sum of its proper divisors (1).

19828649 is an equidigital number, since it uses as much as digits as its factorization.

19828649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 19828649 is about 4452.9371205980. The cubic root of 19828649 is about 270.6643402603.

The spelling of 19828649 in words is "nineteen million, eight hundred twenty-eight thousand, six hundred forty-nine".