1121404440 has 128 divisors (see below), whose sum is σ = 3633336000. Its totient is φ = 275251200.

The previous prime is 1121404397. The next prime is 1121404463. The reversal of 1121404440 is 444041211.

It is a congruent number.

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, 699640 + ... + 701240.

Almost surely, 2^1121404440 is an apocalyptic number.

1121404440 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 1121404440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1816668000).

1121404440 is an abundant number, since it is smaller than the sum of its proper divisors (2511931560).

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

1121404440 is a wasteful number, since it uses less digits than its factorization.

1121404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1121404440 is about 33487.3773234035. The cubic root of 1121404440 is about 1038.9327192000.

Adding to 1121404440 its reverse (444041211), we get a palindrome (1565445651).

The spelling of 1121404440 in words is "one billion, one hundred twenty-one million, four hundred four thousand, four hundred forty".