1191263040 has 336 divisors, whose sum is σ = 4617939456. Its totient is φ = 279244800.

The previous prime is 1191263039. The next prime is 1191263053. The reversal of 1191263040 is 403621911.

1191263040 is a `hidden beast` number, since 1 + 19 + 12 + 630 + 4 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1191262995 and 1191263013.

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 47 ways as a sum of consecutive naturals, for example, 981474 + ... + 982686.

Almost surely, 2^1191263040 is an apocalyptic number.

1191263040 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 1191263040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308969728).

1191263040 is an abundant number, since it is smaller than the sum of its proper divisors (3426676416).

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

1191263040 is a wasteful number, since it uses less digits than its factorization.

1191263040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1191263040 is about 34514.6786164959. The cubic root of 1191263040 is about 1060.0732831736.

Adding to 1191263040 its reverse (403621911), we get a palindrome (1594884951).

The spelling of 1191263040 in words is "one billion, one hundred ninety-one million, two hundred sixty-three thousand, forty".