1189855 has 4 divisors (see below), whose sum is σ = 1427832. Its totient is φ = 951880.

The previous prime is 1189843. The next prime is 1189871. The reversal of 1189855 is 5589811.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1189855 - 2⁵ = 1189823 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118981 + ... + 118990.

It is an arithmetic number, because the mean of its divisors is an integer number (356958).

2^1189855 is an apocalyptic number.

1189855 is a deficient number, since it is larger than the sum of its proper divisors (237977).

1189855 is an equidigital number, since it uses as much as digits as its factorization.

1189855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237976.

The product of its digits is 14400, while the sum is 37.

The square root of 1189855 is about 1090.8047487979. The cubic root of 1189855 is about 105.9655459401.

The spelling of 1189855 in words is "one million, one hundred eighty-nine thousand, eight hundred fifty-five".