1155022440 has 384 divisors, whose sum is σ = 4263235200. Its totient is φ = 248371200.

The previous prime is 1155022403. The next prime is 1155022457. The reversal of 1155022440 is 442205511.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1155022440.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5473935 + ... + 5474145.

It is an arithmetic number, because the mean of its divisors is an integer number (11102175).

Almost surely, 2^1155022440 is an apocalyptic number.

1155022440 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 1155022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131617600).

1155022440 is an abundant number, since it is smaller than the sum of its proper divisors (3108212760).

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

1155022440 is a wasteful number, since it uses less digits than its factorization.

1155022440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1155022440 is about 33985.6210771556. The cubic root of 1155022440 is about 1049.2125433745.

Adding to 1155022440 its reverse (442205511), we get a palindrome (1597227951).

The spelling of 1155022440 in words is "one billion, one hundred fifty-five million, twenty-two thousand, four hundred forty".