819789447 has 16 divisors (see below), whose sum is σ = 1152728960. Its totient is φ = 516795552.

The previous prime is 819789407. The next prime is 819789449. The reversal of 819789447 is 744987918.

It is not a de Polignac number, because 819789447 - 2¹⁰ = 819788423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819789449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18033 + ... + 44325.

It is an arithmetic number, because the mean of its divisors is an integer number (72045560).

Almost surely, 2^819789447 is an apocalyptic number.

819789447 is a deficient number, since it is larger than the sum of its proper divisors (332939513).

819789447 is a wasteful number, since it uses less digits than its factorization.

819789447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26862.

The product of its digits is 4064256, while the sum is 57.

The square root of 819789447 is about 28631.9654756707. The cubic root of 819789447 is about 935.9100434495.

The spelling of 819789447 in words is "eight hundred nineteen million, seven hundred eighty-nine thousand, four hundred forty-seven".