1099789 has 4 divisors (see below), whose sum is σ = 1110780. Its totient is φ = 1088800.

The previous prime is 1099783. The next prime is 1099793. The reversal of 1099789 is 9879901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 537289 + 562500 = 733^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099789 - 2⁵ = 1099757 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 (1099783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5344 + ... + 5545.

It is an arithmetic number, because the mean of its divisors is an integer number (277695).

2^1099789 is an apocalyptic number.

It is an amenable number.

1099789 is a deficient number, since it is larger than the sum of its proper divisors (10991).

1099789 is a wasteful number, since it uses less digits than its factorization.

1099789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10990.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1099789 is about 1048.7082530428. The cubic root of 1099789 is about 103.2214107871.

It can be divided in two parts, 10 and 99789, that added together give a palindrome (99799).

The spelling of 1099789 in words is "one million, ninety-nine thousand, seven hundred eighty-nine".