1131747840 has 120 divisors (see below), whose sum is σ = 3919640868. Its totient is φ = 301793280.

The previous prime is 1131747839. The next prime is 1131747857. The reversal of 1131747840 is 487471311.

It can be written as a sum of positive squares in 2 ways, for example, as 1006665984 + 125081856 = 31728^2 + 11184^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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 = 1131747795 and 1131747804.

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 11 ways as a sum of consecutive naturals, for example, 1521 + ... + 47600.

Almost surely, 2^1131747840 is an apocalyptic number.

1131747840 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 1131747840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1959820434).

1131747840 is an abundant number, since it is smaller than the sum of its proper divisors (2787893028).

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

1131747840 is an equidigital number, since it uses as much as digits as its factorization.

1131747840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49150 (or 49131 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 1131747840 is about 33641.4601347801. The cubic root of 1131747840 is about 1042.1171860154.

The spelling of 1131747840 in words is "one billion, one hundred thirty-one million, seven hundred forty-seven thousand, eight hundred forty".