1191380544 has 84 divisors (see below), whose sum is σ = 3423513600. Its totient is φ = 396122880.

The previous prime is 1191380543. The next prime is 1191380591. The reversal of 1191380544 is 4450831911.

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 = 1191380499 and 1191380508.

It is not an unprimeable number, because it can be changed into a prime (1191380543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245857 + ... + 250655.

Almost surely, 2^1191380544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1191380544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711756800).

1191380544 is an abundant number, since it is smaller than the sum of its proper divisors (2232133056).

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

1191380544 is a wasteful number, since it uses less digits than its factorization.

1191380544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248 (or 5235 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1191380544 is about 34516.3808067995. The cubic root of 1191380544 is about 1060.1081365887.

The spelling of 1191380544 in words is "one billion, one hundred ninety-one million, three hundred eighty thousand, five hundred forty-four".