1191194640 has 160 divisors (see below), whose sum is σ = 4123069440. Its totient is φ = 316099584.

The previous prime is 1191194597. The next prime is 1191194671. The reversal of 1191194640 is 464911911.

1191194640 is a `hidden beast` number, since 1 + 1 + 9 + 1 + 1 + 9 + 4 + 640 = 666.

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 = 1191194595 and 1191194604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480444 + ... + 482916.

It is an arithmetic number, because the mean of its divisors is an integer number (25769184).

Almost surely, 2^1191194640 is an apocalyptic number.

1191194640 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 1191194640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061534720).

1191194640 is an abundant number, since it is smaller than the sum of its proper divisors (2931874800).

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

1191194640 is a wasteful number, since it uses less digits than its factorization.

1191194640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718 (or 2706 counting only the distinct ones).

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

The square root of 1191194640 is about 34513.6877195121. The cubic root of 1191194640 is about 1060.0529936719.

The spelling of 1191194640 in words is "one billion, one hundred ninety-one million, one hundred ninety-four thousand, six hundred forty".