1099856 has 20 divisors (see below), whose sum is σ = 2172852. Its totient is φ = 539136.

The previous prime is 1099843. The next prime is 1099859. The reversal of 1099856 is 6589901.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 99856 = 1000^2 + 316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099859) 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, 200 + ... + 1496.

2^1099856 is an apocalyptic number.

1099856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1099856 is a deficient number, since it is larger than the sum of its proper divisors (1072996).

1099856 is a wasteful number, since it uses less digits than its factorization.

1099856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1099856 is about 1048.7401966169. The cubic root of 1099856 is about 103.2235068540.

The spelling of 1099856 in words is "one million, ninety-nine thousand, eight hundred fifty-six".