19825849 has 2 divisors, whose sum is σ = 19825850. Its totient is φ = 19825848.

The previous prime is 19825811. The next prime is 19825867. The reversal of 19825849 is 94852891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16867449 + 2958400 = 4107^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 19825849 - 2¹³ = 19817657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19825799 and 19825808.

It is not a weakly prime, because it can be changed into another prime (19825049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9912924 + 9912925.

It is an arithmetic number, because the mean of its divisors is an integer number (9912925).

Almost surely, 2^19825849 is an apocalyptic number.

It is an amenable number.

19825849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19825849 is an equidigital number, since it uses as much as digits as its factorization.

19825849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 19825849 is about 4452.6227102686. The cubic root of 19825849 is about 270.6515995061.

The spelling of 19825849 in words is "nineteen million, eight hundred twenty-five thousand, eight hundred forty-nine".