1188642005 has 4 divisors (see below), whose sum is σ = 1426370412. Its totient is φ = 950913600.

The previous prime is 1188641963. The next prime is 1188642011. The reversal of 1188642005 is 5002468811.

1188642005 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 337052881 + 851589124 = 18359^2 + 29182^2 .

It is not a de Polignac number, because 1188642005 - 2¹⁴ = 1188625621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118864196 + ... + 118864205.

It is an arithmetic number, because the mean of its divisors is an integer number (356592603).

Almost surely, 2^1188642005 is an apocalyptic number.

It is an amenable number.

1188642005 is a deficient number, since it is larger than the sum of its proper divisors (237728407).

1188642005 is an equidigital number, since it uses as much as digits as its factorization.

1188642005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237728406.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1188642005 is about 34476.6878484578. The cubic root of 1188642005 is about 1059.2952491775.

The spelling of 1188642005 in words is "one billion, one hundred eighty-eight million, six hundred forty-two thousand, five".