827785447 has 2 divisors, whose sum is σ = 827785448. Its totient is φ = 827785446.

The previous prime is 827785421. The next prime is 827785457. The reversal of 827785447 is 744587728.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-827785447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 827785394 and 827785403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827785417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413892723 + 413892724.

It is an arithmetic number, because the mean of its divisors is an integer number (413892724).

Almost surely, 2^827785447 is an apocalyptic number.

827785447 is a deficient number, since it is larger than the sum of its proper divisors (1).

827785447 is an equidigital number, since it uses as much as digits as its factorization.

827785447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3512320, while the sum is 52.

The square root of 827785447 is about 28771.2607822459. The cubic root of 827785447 is about 938.9430730247.

The spelling of 827785447 in words is "eight hundred twenty-seven million, seven hundred eighty-five thousand, four hundred forty-seven".