1185861 has 4 divisors (see below), whose sum is σ = 1581152. Its totient is φ = 790572.

The previous prime is 1185859. The next prime is 1185871. The reversal of 1185861 is 1685811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1185861 - 2¹ = 1185859 is a prime.

It is a super-2 number, since 2×1185861² = 2812532622642, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1185861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1185851) 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 3 ways as a sum of consecutive naturals, for example, 197641 + ... + 197646.

It is an arithmetic number, because the mean of its divisors is an integer number (395288).

2^1185861 is an apocalyptic number.

It is an amenable number.

1185861 is a deficient number, since it is larger than the sum of its proper divisors (395291).

1185861 is an equidigital number, since it uses as much as digits as its factorization.

1185861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395290.

The product of its digits is 1920, while the sum is 30.

The square root of 1185861 is about 1088.9724514422. The cubic root of 1185861 is about 105.8468477723.

The spelling of 1185861 in words is "one million, one hundred eighty-five thousand, eight hundred sixty-one".