1103991840 has 288 divisors, whose sum is σ = 4445715456. Its totient is φ = 244131840.

The previous prime is 1103991821. The next prime is 1103991841. The reversal of 1103991840 is 481993011.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1103991795 and 1103991804.

It is not an unprimeable number, because it can be changed into a prime (1103991841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 310714 + ... + 314246.

It is an arithmetic number, because the mean of its divisors is an integer number (15436512).

Almost surely, 2^1103991840 is an apocalyptic number.

1103991840 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 1103991840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222857728).

1103991840 is an abundant number, since it is smaller than the sum of its proper divisors (3341723616).

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

1103991840 is a wasteful number, since it uses less digits than its factorization.

1103991840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1103991840 is about 33226.3726578752. The cubic root of 1103991840 is about 1033.5273040886.

The spelling of 1103991840 in words is "one billion, one hundred three million, nine hundred ninety-one thousand, eight hundred forty".