1099899 has 20 divisors (see below), whose sum is σ = 1692064. Its totient is φ = 711504.

The previous prime is 1099867. The next prime is 1099927. The reversal of 1099899 is 9989901.

It is not a de Polignac number, because 1099899 - 2⁵ = 1099867 is a prime.

It is a Duffinian 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 19 ways as a sum of consecutive naturals, for example, 2814 + ... + 3180.

2^1099899 is an apocalyptic number.

1099899 is a deficient number, since it is larger than the sum of its proper divisors (592165).

1099899 is an equidigital number, since it uses as much as digits as its factorization.

1099899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 1099899 is about 1048.7606972041. The cubic root of 1099899 is about 103.2248520462.

The spelling of 1099899 in words is "one million, ninety-nine thousand, eight hundred ninety-nine".