1165863 has 4 divisors (see below), whose sum is σ = 1554488. Its totient is φ = 777240.

The previous prime is 1165861. The next prime is 1165873. The reversal of 1165863 is 3685611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3685611 = 3 ⋅1228537.

It is not a de Polignac number, because 1165863 - 2¹ = 1165861 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1165863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194308 + ... + 194313.

It is an arithmetic number, because the mean of its divisors is an integer number (388622).

2^1165863 is an apocalyptic number.

1165863 is a deficient number, since it is larger than the sum of its proper divisors (388625).

1165863 is an equidigital number, since it uses as much as digits as its factorization.

1165863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388624.

The product of its digits is 4320, while the sum is 30.

The square root of 1165863 is about 1079.7513602677. The cubic root of 1165863 is about 105.2484818004.

The spelling of 1165863 in words is "one million, one hundred sixty-five thousand, eight hundred sixty-three".