1091943680 has 144 divisors (see below), whose sum is σ = 2803550400. Its totient is φ = 406241280.

The previous prime is 1091943679. The next prime is 1091943691. The reversal of 1091943680 is 863491901.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1434500 + ... + 1435260.

It is an arithmetic number, because the mean of its divisors is an integer number (19469100).

Almost surely, 2^1091943680 is an apocalyptic number.

1091943680 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 1091943680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1401775200).

1091943680 is an abundant number, since it is smaller than the sum of its proper divisors (1711606720).

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

1091943680 is an equidigital number, since it uses as much as digits as its factorization.

1091943680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1091943680 is about 33044.5711123628. The cubic root of 1091943680 is about 1029.7538230909.

The spelling of 1091943680 in words is "one billion, ninety-one million, nine hundred forty-three thousand, six hundred eighty".