1121231440 has 40 divisors (see below), whose sum is σ = 2979273600. Its totient is φ = 384422016.

The previous prime is 1121231411. The next prime is 1121231453. The reversal of 1121231440 is 441321211.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000540 + ... + 1001659.

It is an arithmetic number, because the mean of its divisors is an integer number (74481840).

Almost surely, 2^1121231440 is an apocalyptic number.

1121231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121231440 is an abundant number, since it is smaller than the sum of its proper divisors (1858042160).

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

1121231440 is a wasteful number, since it uses less digits than its factorization.

1121231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002219 (or 2002213 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1121231440 is about 33484.7941609322. The cubic root of 1121231440 is about 1038.8792907795.

Adding to 1121231440 its reverse (441321211), we get a palindrome (1562552651).

The spelling of 1121231440 in words is "one billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred forty".