1121440 has 48 divisors (see below), whose sum is σ = 2727648. Its totient is φ = 435456.

The previous prime is 1121431. The next prime is 1121443. The reversal of 1121440 is 441211.

It is a self number, because there is not a number n which added to its sum of digits gives 1121440.

It is not an unprimeable number, because it can be changed into a prime (1121443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6799 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (56826).

2^1121440 is an apocalyptic number.

1121440 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 1121440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1363824).

1121440 is an abundant number, since it is smaller than the sum of its proper divisors (1606208).

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

1121440 is a wasteful number, since it uses less digits than its factorization.

1121440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1121440 is about 1058.9806419383. The cubic root of 1121440 is about 103.8943700685.

Adding to 1121440 its reverse (441211), we get a palindrome (1562651).

The spelling of 1121440 in words is "one million, one hundred twenty-one thousand, four hundred forty".