1121183720 has 64 divisors (see below), whose sum is σ = 2617971840. Its totient is φ = 431827200.

The previous prime is 1121183717. The next prime is 1121183747. The reversal of 1121183720 is 273811211.

It is a self number, because there is not a number n which added to its sum of digits gives 1121183720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117530 + ... + 126710.

It is an arithmetic number, because the mean of its divisors is an integer number (40905810).

Almost surely, 2^1121183720 is an apocalyptic number.

1121183720 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 1121183720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308985920).

1121183720 is an abundant number, since it is smaller than the sum of its proper divisors (1496788120).

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

1121183720 is a wasteful number, since it uses less digits than its factorization.

1121183720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9306 (or 9302 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1121183720 is about 33484.0815911083. The cubic root of 1121183720 is about 1038.8645522158.

Adding to 1121183720 its reverse (273811211), we get a palindrome (1394994931).

The spelling of 1121183720 in words is "one billion, one hundred twenty-one million, one hundred eighty-three thousand, seven hundred twenty".