1123406685840 has 160 divisors (see below), whose sum is σ = 3566471838336. Its totient is φ = 292368384000.

The previous prime is 1123406685811. The next prime is 1123406685851. The reversal of 1123406685840 is 485866043211.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1123406685840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12721840 + ... + 12809840.

Almost surely, 2^{1123406685840} is an apocalyptic number.

1123406685840 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 1123406685840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1783235919168).

1123406685840 is an abundant number, since it is smaller than the sum of its proper divisors (2443065152496).

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

1123406685840 is a wasteful number, since it uses less digits than its factorization.

1123406685840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89297 (or 89291 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 1123406685840 in words is "one trillion, one hundred twenty-three billion, four hundred six million, six hundred eighty-five thousand, eight hundred forty".