1188155 has 4 divisors (see below), whose sum is σ = 1425792. Its totient is φ = 950520.

The previous prime is 1188151. The next prime is 1188167. The reversal of 1188155 is 5518811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5518811 = 149 ⋅37039.

It is not a de Polignac number, because 1188155 - 2² = 1188151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188151) 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, 118811 + ... + 118820.

It is an arithmetic number, because the mean of its divisors is an integer number (356448).

2^1188155 is an apocalyptic number.

1188155 is a deficient number, since it is larger than the sum of its proper divisors (237637).

1188155 is an equidigital number, since it uses as much as digits as its factorization.

1188155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237636.

The product of its digits is 1600, while the sum is 29.

The square root of 1188155 is about 1090.0252290658. The cubic root of 1188155 is about 105.9150559537.

The spelling of 1188155 in words is "one million, one hundred eighty-eight thousand, one hundred fifty-five".