1188609 has 4 divisors (see below), whose sum is σ = 1584816. Its totient is φ = 792404.

The previous prime is 1188601. The next prime is 1188613. The reversal of 1188609 is 9068811.

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 a cyclic number.

It is not a de Polignac number, because 1188609 - 2³ = 1188601 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188609.

It is not an unprimeable number, because it can be changed into a prime (1188601) 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, 198099 + ... + 198104.

It is an arithmetic number, because the mean of its divisors is an integer number (396204).

2^1188609 is an apocalyptic number.

It is an amenable number.

1188609 is a deficient number, since it is larger than the sum of its proper divisors (396207).

1188609 is an equidigital number, since it uses as much as digits as its factorization.

1188609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396206.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1188609 is about 1090.2334612366. The cubic root of 1188609 is about 105.9285444610.

The spelling of 1188609 in words is "one million, one hundred eighty-eight thousand, six hundred nine".