1185813 has 16 divisors (see below), whose sum is σ = 1805760. Its totient is φ = 768528.

The previous prime is 1185797. The next prime is 1185817. The reversal of 1185813 is 3185811.

It is not a de Polignac number, because 1185813 - 2⁴ = 1185797 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1185817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406 + ... + 1592.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^1185813 is an apocalyptic number.

It is an amenable number.

1185813 is a deficient number, since it is larger than the sum of its proper divisors (619947).

1185813 is a wasteful number, since it uses less digits than its factorization.

1185813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1227 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1185813 is about 1088.9504120941. The cubic root of 1185813 is about 105.8454196350.

The spelling of 1185813 in words is "one million, one hundred eighty-five thousand, eight hundred thirteen".