1155865 has 16 divisors (see below), whose sum is σ = 1526400. Its totient is φ = 837936.

The previous prime is 1155863. The next prime is 1155899. The reversal of 1155865 is 5685511.

It is not a de Polignac number, because 1155865 - 2¹ = 1155863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155863) 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, 50244 + ... + 50266.

It is an arithmetic number, because the mean of its divisors is an integer number (95400).

2^1155865 is an apocalyptic number.

It is an amenable number.

1155865 is a deficient number, since it is larger than the sum of its proper divisors (370535).

1155865 is an frugal number, since it uses more digits than its factorization.

1155865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 47 counting only the distinct ones).

The product of its digits is 6000, while the sum is 31.

The square root of 1155865 is about 1075.1116221119. Note that the first 3 decimals coincide. The cubic root of 1155865 is about 104.9467606139.

The spelling of 1155865 in words is "one million, one hundred fifty-five thousand, eight hundred sixty-five".