1186861 has 4 divisors (see below), whose sum is σ = 1278172. Its totient is φ = 1095552.

The previous prime is 1186847. The next prime is 1186879. The reversal of 1186861 is 1686811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 820836 = 605^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1186861 - 2⁹ = 1186349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1186811) 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, 45636 + ... + 45661.

It is an arithmetic number, because the mean of its divisors is an integer number (319543).

2^1186861 is an apocalyptic number.

It is an amenable number.

1186861 is a deficient number, since it is larger than the sum of its proper divisors (91311).

1186861 is an equidigital number, since it uses as much as digits as its factorization.

1186861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91310.

The product of its digits is 2304, while the sum is 31.

The square root of 1186861 is about 1089.4315031245. The cubic root of 1186861 is about 105.8765918737.

The spelling of 1186861 in words is "one million, one hundred eighty-six thousand, eight hundred sixty-one".