1083990856 has 64 divisors (see below), whose sum is σ = 2352430080. Its totient is φ = 463795200.

The previous prime is 1083990833. The next prime is 1083990889. The reversal of 1083990856 is 6580993801.

It is a super-2 number, since 2×1083990856² = 2350072351783225472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113881 + ... + 123031.

It is an arithmetic number, because the mean of its divisors is an integer number (36756720).

Almost surely, 2^1083990856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1083990856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176215040).

1083990856 is an abundant number, since it is smaller than the sum of its proper divisors (1268439224).

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

1083990856 is a wasteful number, since it uses less digits than its factorization.

1083990856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9254 (or 9250 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 1083990856 is about 32924.0164014052. The cubic root of 1083990856 is about 1027.2477678612.

The spelling of 1083990856 in words is "one billion, eighty-three million, nine hundred ninety thousand, eight hundred fifty-six".