1188005 has 24 divisors (see below), whose sum is σ = 1790712. Its totient is φ = 749952.

The previous prime is 1188001. The next prime is 1188007. The reversal of 1188005 is 5008811.

1188005 = T₄₂₁ + T₄₂₂ + ... + T₄₃₃.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 1162084 = 161^2 + 1078^2 .

It is not a de Polignac number, because 1188005 - 2² = 1188001 is a prime.

It is a super-2 number, since 2×1188005² = 2822711760050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188001) 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 23 ways as a sum of consecutive naturals, for example, 2999 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (74613).

2^1188005 is an apocalyptic number.

It is an amenable number.

1188005 is a deficient number, since it is larger than the sum of its proper divisors (602707).

1188005 is a wasteful number, since it uses less digits than its factorization.

1188005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 1188005 is about 1089.9564211472. The cubic root of 1188005 is about 105.9105986433.

The spelling of 1188005 in words is "one million, one hundred eighty-eight thousand, five".