1123505856 has 112 divisors (see below), whose sum is σ = 3603223680. Its totient is φ = 340450560.

The previous prime is 1123505833. The next prime is 1123505893. The reversal of 1123505856 is 6585053211.

It is a happy number.

1123505856 is a `hidden beast` number, since 1 + 1 + 23 + 50 + 585 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1123505856.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10546 + ... + 48561.

It is an arithmetic number, because the mean of its divisors is an integer number (32171640).

Almost surely, 2^1123505856 is an apocalyptic number.

1123505856 is a gapful number since it is divisible by the number (16) 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 1123505856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1801611840).

1123505856 is an abundant number, since it is smaller than the sum of its proper divisors (2479717824).

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

1123505856 is a wasteful number, since it uses less digits than its factorization.

1123505856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59139 (or 59123 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 1123505856 is about 33518.7388784244. The cubic root of 1123505856 is about 1039.5812712747.

The spelling of 1123505856 in words is "one billion, one hundred twenty-three million, five hundred five thousand, eight hundred fifty-six".