1187005 has 4 divisors (see below), whose sum is σ = 1424412. Its totient is φ = 949600.

The previous prime is 1187003. The next prime is 1187009. The reversal of 1187005 is 5007811.

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 128164 + 1058841 = 358^2 + 1029^2 .

It is not a de Polignac number, because 1187005 - 2¹ = 1187003 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118696 + ... + 118705.

It is an arithmetic number, because the mean of its divisors is an integer number (356103).

2^1187005 is an apocalyptic number.

It is an amenable number.

1187005 is a deficient number, since it is larger than the sum of its proper divisors (237407).

1187005 is an equidigital number, since it uses as much as digits as its factorization.

1187005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237406.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 1187005 is about 1089.4975906352. The cubic root of 1187005 is about 105.8808736479.

The spelling of 1187005 in words is "one million, one hundred eighty-seven thousand, five".