819406285 has 4 divisors (see below), whose sum is σ = 983287548. Its totient is φ = 655525024.

The previous prime is 819406283. The next prime is 819406309. The reversal of 819406285 is 582604918.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 635695369 + 183710916 = 25213^2 + 13554^2 .

It is a cyclic number.

It is not a de Polignac number, because 819406285 - 2¹ = 819406283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819406283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81940624 + ... + 81940633.

It is an arithmetic number, because the mean of its divisors is an integer number (245821887).

Almost surely, 2^819406285 is an apocalyptic number.

It is an amenable number.

819406285 is a deficient number, since it is larger than the sum of its proper divisors (163881263).

819406285 is a wasteful number, since it uses less digits than its factorization.

819406285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163881262.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 819406285 is about 28625.2735358110. The cubic root of 819406285 is about 935.7642088292.

The spelling of 819406285 in words is "eight hundred nineteen million, four hundred six thousand, two hundred eighty-five".