1155816 has 32 divisors (see below), whose sum is σ = 3211200. Its totient is φ = 385200.

The previous prime is 1155733. The next prime is 1155821. The reversal of 1155816 is 6185511.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155816.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2460 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (100350).

2^1155816 is an apocalyptic number.

It is an amenable number.

1155816 is an abundant number, since it is smaller than the sum of its proper divisors (2055384).

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

1155816 is a wasteful number, since it uses less digits than its factorization.

1155816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366 (or 5356 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 1155816 is about 1075.0888335389. The cubic root of 1155816 is about 104.9452776080.

The spelling of 1155816 in words is "one million, one hundred fifty-five thousand, eight hundred sixteen".