1123840 has 40 divisors (see below), whose sum is σ = 2700720. Its totient is φ = 448512.

The previous prime is 1123807. The next prime is 1123841. The reversal of 1123840 is 483211.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2341 + ... + 2779.

It is an arithmetic number, because the mean of its divisors is an integer number (67518).

2^1123840 is an apocalyptic number.

1123840 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 1123840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1350360).

1123840 is an abundant number, since it is smaller than the sum of its proper divisors (1576880).

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

1123840 is an frugal number, since it uses more digits than its factorization.

1123840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1123840 is about 1060.1132015026. The cubic root of 1123840 is about 103.9684322336.

The spelling of 1123840 in words is "one million, one hundred twenty-three thousand, eight hundred forty".