1115865 has 24 divisors (see below), whose sum is σ = 1959048. Its totient is φ = 587520.

The previous prime is 1115857. The next prime is 1115879. The reversal of 1115865 is 5685111.

It can be written as a sum of positive squares in 4 ways, for example, as 729 + 1115136 = 27^2 + 1056^2 .

It is not a de Polignac number, because 1115865 - 2³ = 1115857 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6075 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (81627).

2^1115865 is an apocalyptic number.

1115865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1115865 is a deficient number, since it is larger than the sum of its proper divisors (843183).

1115865 is a wasteful number, since it uses less digits than its factorization.

1115865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 326 counting only the distinct ones).

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

The square root of 1115865 is about 1056.3451140607. The cubic root of 1115865 is about 103.7219210800.

It can be divided in two parts, 11 and 15865, that added together give a square (15876 = 126²).

The spelling of 1115865 in words is "one million, one hundred fifteen thousand, eight hundred sixty-five".