1091885640 has 32 divisors (see below), whose sum is σ = 3275657280. Its totient is φ = 291169472.

The previous prime is 1091885633. The next prime is 1091885653. The reversal of 1091885640 is 465881901.

It is a junction number, because it is equal to n+sod(n) for n = 1091885592 and 1091885601.

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 7 ways as a sum of consecutive naturals, for example, 4549404 + ... + 4549643.

It is an arithmetic number, because the mean of its divisors is an integer number (102364290).

Almost surely, 2^1091885640 is an apocalyptic number.

1091885640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091885640 is an abundant number, since it is smaller than the sum of its proper divisors (2183771640).

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

1091885640 is a wasteful number, since it uses less digits than its factorization.

1091885640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099061 (or 9099057 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1091885640 is about 33043.6928928956. The cubic root of 1091885640 is about 1029.7355779586.

The spelling of 1091885640 in words is "one billion, ninety-one million, eight hundred eighty-five thousand, six hundred forty".