1131220040 has 64 divisors (see below), whose sum is σ = 2661759360. Its totient is φ = 431861760.

The previous prime is 1131220037. The next prime is 1131220087. The reversal of 1131220040 is 400221311.

It is a junction number, because it is equal to n+sod(n) for n = 1131219997 and 1131220024.

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, 529775 + ... + 531905.

It is an arithmetic number, because the mean of its divisors is an integer number (41589990).

Almost surely, 2^1131220040 is an apocalyptic number.

1131220040 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 1131220040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330879680).

1131220040 is an abundant number, since it is smaller than the sum of its proper divisors (1530539320).

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

1131220040 is a wasteful number, since it uses less digits than its factorization.

1131220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2738 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1131220040 is about 33633.6147328829. The cubic root of 1131220040 is about 1041.9551608253.

Adding to 1131220040 its reverse (400221311), we get a palindrome (1531441351).

The spelling of 1131220040 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, forty".