1099880 has 32 divisors (see below), whose sum is σ = 2557440. Its totient is φ = 425280.

The previous prime is 1099867. The next prime is 1099927. The reversal of 1099880 is 889901.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1099880.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 797 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (79920).

2^1099880 is an apocalyptic number.

1099880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1099880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278720).

1099880 is an abundant number, since it is smaller than the sum of its proper divisors (1457560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1099880 is a wasteful number, since it uses less digits than its factorization.

1099880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1099880 is about 1048.7516388545. The cubic root of 1099880 is about 103.2242576633.

The spelling of 1099880 in words is "one million, ninety-nine thousand, eight hundred eighty".