1099903 has 6 divisors (see below), whose sum is σ = 1279536. Its totient is φ = 942732.

The previous prime is 1099867. The next prime is 1099927. The reversal of 1099903 is 3099901.

It is not a de Polignac number, because 1099903 - 2⁹ = 1099391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099933) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11175 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (213256).

2^1099903 is an apocalyptic number.

1099903 is a deficient number, since it is larger than the sum of its proper divisors (179633).

1099903 is an equidigital number, since it uses as much as digits as its factorization.

1099903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22461 (or 22454 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 1099903 is about 1048.7626042151. The cubic root of 1099903 is about 103.2249771785.

It can be divided in two parts, 1099 and 903, that added together give a palindrome (2002).

The spelling of 1099903 in words is "one million, ninety-nine thousand, nine hundred three".