1131788240 has 80 divisors (see below), whose sum is σ = 2900439360. Its totient is φ = 407285760.

The previous prime is 1131788239. The next prime is 1131788261. The reversal of 1131788240 is 428871311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1131788240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78731 + ... + 91989.

It is an arithmetic number, because the mean of its divisors is an integer number (36255492).

Almost surely, 2^1131788240 is an apocalyptic number.

1131788240 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 1131788240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450219680).

1131788240 is an abundant number, since it is smaller than the sum of its proper divisors (1768651120).

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

1131788240 is a wasteful number, since it uses less digits than its factorization.

1131788240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13380 (or 13374 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1131788240 is about 33642.0605789836. The cubic root of 1131788240 is about 1042.1295860194.

The spelling of 1131788240 in words is "one billion, one hundred thirty-one million, seven hundred eighty-eight thousand, two hundred forty".