1122865920 has 216 divisors, whose sum is σ = 4238659152. Its totient is φ = 272179200.

The previous prime is 1122865907. The next prime is 1122865927. The reversal of 1122865920 is 295682211.

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

It is not an unprimeable number, because it can be changed into a prime (1122865927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122290 + ... + 131150.

It is an arithmetic number, because the mean of its divisors is an integer number (19623422).

Almost surely, 2^1122865920 is an apocalyptic number.

1122865920 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 1122865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119329576).

1122865920 is an abundant number, since it is smaller than the sum of its proper divisors (3115793232).

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

1122865920 is a wasteful number, since it uses less digits than its factorization.

1122865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8899 (or 8882 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1122865920 is about 33509.1915748500. The cubic root of 1122865920 is about 1039.3838559472.

The spelling of 1122865920 in words is "one billion, one hundred twenty-two million, eight hundred sixty-five thousand, nine hundred twenty".