1081109940 has 48 divisors (see below), whose sum is σ = 3158725248. Its totient is φ = 275761024.

The previous prime is 1081109927. The next prime is 1081109941. The reversal of 1081109940 is 499011801.

1081109940 = 6845² + 6846² + ... + 6867².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081109941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390327 + ... + 393086.

It is an arithmetic number, because the mean of its divisors is an integer number (65806776).

Almost surely, 2^1081109940 is an apocalyptic number.

1081109940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081109940 is an abundant number, since it is smaller than the sum of its proper divisors (2077615308).

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

1081109940 is a wasteful number, since it uses less digits than its factorization.

1081109940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783448 (or 783446 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 1081109940 is about 32880.2363130194. The cubic root of 1081109940 is about 1026.3369237241.

The spelling of 1081109940 in words is "one billion, eighty-one million, one hundred nine thousand, nine hundred forty".