1099889 has 4 divisors (see below), whose sum is σ = 1257024. Its totient is φ = 942756.

The previous prime is 1099867. The next prime is 1099927. The reversal of 1099889 is 9889901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1099889 - 2⁸ = 1099633 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 (1099859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78557 + ... + 78570.

It is an arithmetic number, because the mean of its divisors is an integer number (314256).

2^1099889 is an apocalyptic number.

It is an amenable number.

1099889 is a deficient number, since it is larger than the sum of its proper divisors (157135).

1099889 is an equidigital number, since it uses as much as digits as its factorization.

1099889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157134.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1099889 is about 1048.7559296614. The cubic root of 1099889 is about 103.2245392139.

It can be divided in two parts, 10 and 99889, that added together give a palindrome (99899).

The spelling of 1099889 in words is "one million, ninety-nine thousand, eight hundred eighty-nine".