1099805 has 18 divisors (see below), whose sum is σ = 1558494. Its totient is φ = 742896.

The previous prime is 1099799. The next prime is 1099807. The reversal of 1099805 is 5089901.

It can be written as a sum of positive squares in only one way, i.e., 879844 + 219961 = 938^2 + 469^2 .

It is not a de Polignac number, because 1099805 - 2⁶ = 1099741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16382 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (86583).

2^1099805 is an apocalyptic number.

It is an amenable number.

1099805 is a deficient number, since it is larger than the sum of its proper divisors (458689).

1099805 is an frugal number, since it uses more digits than its factorization.

1099805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1099805 is about 1048.7158814474. The cubic root of 1099805 is about 103.2219113481.

The spelling of 1099805 in words is "one million, ninety-nine thousand, eight hundred five".