1099816 has 8 divisors (see below), whose sum is σ = 2062170. Its totient is φ = 549904.

The previous prime is 1099807. The next prime is 1099817. The reversal of 1099816 is 6189901.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 119716 = 990^2 + 346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1099817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68731 + ... + 68746.

2^1099816 is an apocalyptic number.

It is an amenable number.

1099816 is a deficient number, since it is larger than the sum of its proper divisors (962354).

1099816 is a wasteful number, since it uses less digits than its factorization.

1099816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137483 (or 137479 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1099816 is about 1048.7211259434. The cubic root of 1099816 is about 103.2222554810. Note that the first 4 decimals are identical.

The spelling of 1099816 in words is "one million, ninety-nine thousand, eight hundred sixteen".