1123440 has 80 divisors (see below), whose sum is σ = 3618816. Its totient is φ = 288000.

The previous prime is 1123439. The next prime is 1123477. The reversal of 1123440 is 443211.

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

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7365 + ... + 7515.

2^1123440 is an apocalyptic number.

1123440 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 1123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809408).

1123440 is an abundant number, since it is smaller than the sum of its proper divisors (2495376).

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

1123440 is a wasteful number, since it uses less digits than its factorization.

1123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1123440 is about 1059.9245256149. The cubic root of 1123440 is about 103.9560958667.

Adding to 1123440 its reverse (443211), we get a palindrome (1566651).

The spelling of 1123440 in words is "one million, one hundred twenty-three thousand, four hundred forty".