1191880340 has 24 divisors (see below), whose sum is σ = 2860513152. Its totient is φ = 408644640.

The previous prime is 1191880331. The next prime is 1191880411. The reversal of 1191880340 is 430881911.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1191880340.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4256576 + ... + 4256855.

It is an arithmetic number, because the mean of its divisors is an integer number (119188048).

Almost surely, 2^1191880340 is an apocalyptic number.

1191880340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191880340 is an abundant number, since it is smaller than the sum of its proper divisors (1668632812).

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

1191880340 is a wasteful number, since it uses less digits than its factorization.

1191880340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513447 (or 8513445 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1191880340 is about 34523.6200303502. The cubic root of 1191880340 is about 1060.2563578366.

The spelling of 1191880340 in words is "one billion, one hundred ninety-one million, eight hundred eighty thousand, three hundred forty".