1085805816 has 16 divisors (see below), whose sum is σ = 2714514600. Its totient is φ = 361935264.

The previous prime is 1085805779. The next prime is 1085805821. The reversal of 1085805816 is 6185085801.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22620931 + ... + 22620978.

Almost surely, 2^1085805816 is an apocalyptic number.

It is an amenable number.

1085805816 is an abundant number, since it is smaller than the sum of its proper divisors (1628708784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1085805816 is a wasteful number, since it uses less digits than its factorization.

1085805816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45241918 (or 45241914 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 42.

The square root of 1085805816 is about 32951.5677320518. The cubic root of 1085805816 is about 1027.8207659379.

The spelling of 1085805816 in words is "one billion, eighty-five million, eight hundred five thousand, eight hundred sixteen".