1185820 has 24 divisors (see below), whose sum is σ = 2510928. Its totient is φ = 470400.

The previous prime is 1185817. The next prime is 1185823. The reversal of 1185820 is 285811.

It is an interprime number because it is at equal distance from previous prime (1185817) and next prime (1185823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1185823) 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 7 ways as a sum of consecutive naturals, for example, 4080 + ... + 4360.

It is an arithmetic number, because the mean of its divisors is an integer number (104622).

2^1185820 is an apocalyptic number.

1185820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1185820 is an abundant number, since it is smaller than the sum of its proper divisors (1325108).

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

1185820 is a wasteful number, since it uses less digits than its factorization.

1185820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1185820 is about 1088.9536261935. The cubic root of 1185820 is about 105.8456279074.

Subtracting from 1185820 its reverse (285811), we obtain a palindrome (900009).

The spelling of 1185820 in words is "one million, one hundred eighty-five thousand, eight hundred twenty".