1155244812 has 48 divisors (see below), whose sum is σ = 2799588960. Its totient is φ = 370327552.

The previous prime is 1155244801. The next prime is 1155244813. The reversal of 1155244812 is 2184425511.

It is not an unprimeable number, because it can be changed into a prime (1155244813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82978 + ... + 95894.

It is an arithmetic number, because the mean of its divisors is an integer number (58324770).

Almost surely, 2^1155244812 is an apocalyptic number.

1155244812 is a gapful number since it is divisible by the number (12) 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 1155244812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399794480).

1155244812 is an abundant number, since it is smaller than the sum of its proper divisors (1644344148).

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

1155244812 is a wasteful number, since it uses less digits than its factorization.

1155244812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13210 (or 13208 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 1155244812 is about 33988.8924797499. The cubic root of 1155244812 is about 1049.2798726639.

The spelling of 1155244812 in words is "one billion, one hundred fifty-five million, two hundred forty-four thousand, eight hundred twelve".