1099320040 has 128 divisors (see below), whose sum is σ = 3094801920. Its totient is φ = 342144000.

The previous prime is 1099320017. The next prime is 1099320041. The reversal of 1099320040 is 400239901.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1099319990 and 1099320008.

It is not an unprimeable number, because it can be changed into a prime (1099320041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219565 + ... + 224515.

It is an arithmetic number, because the mean of its divisors is an integer number (24178140).

Almost surely, 2^1099320040 is an apocalyptic number.

1099320040 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 1099320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547400960).

1099320040 is an abundant number, since it is smaller than the sum of its proper divisors (1995481880).

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

1099320040 is a wasteful number, since it uses less digits than its factorization.

1099320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043 (or 5039 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1099320040 is about 33155.9955362526. The cubic root of 1099320040 is about 1032.0673718611.

Adding to 1099320040 its reverse (400239901), we get a palindrome (1499559941).

The spelling of 1099320040 in words is "one billion, ninety-nine million, three hundred twenty thousand, forty".