1131440 has 20 divisors (see below), whose sum is σ = 2630784. Its totient is φ = 452544.

The previous prime is 1131437. The next prime is 1131451. The reversal of 1131440 is 441311.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6992 + ... + 7151.

2^1131440 is an apocalyptic number.

1131440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131440 is an abundant number, since it is smaller than the sum of its proper divisors (1499344).

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

1131440 is a wasteful number, since it uses less digits than its factorization.

1131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14156 (or 14150 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1131440 is about 1063.6916846530. The cubic root of 1131440 is about 104.2022690748.

Adding to 1131440 its reverse (441311), we get a palindrome (1572751).

The spelling of 1131440 in words is "one million, one hundred thirty-one thousand, four hundred forty".