1189887 has 4 divisors (see below), whose sum is σ = 1586520. Its totient is φ = 793256.

The previous prime is 1189879. The next prime is 1189891. The reversal of 1189887 is 7889811.

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

It is a cyclic number.

It is not a de Polignac number, because 1189887 - 2³ = 1189879 is a prime.

It is an Ulam number.

It is a D-number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189807) 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, 198312 + ... + 198317.

It is an arithmetic number, because the mean of its divisors is an integer number (396630).

2^1189887 is an apocalyptic number.

1189887 is a deficient number, since it is larger than the sum of its proper divisors (396633).

1189887 is an equidigital number, since it uses as much as digits as its factorization.

1189887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396632.

The product of its digits is 32256, while the sum is 42.

The square root of 1189887 is about 1090.8194167689. The cubic root of 1189887 is about 105.9664958786.

It can be divided in two parts, 11 and 89887, that added together give a palindrome (89898).

The spelling of 1189887 in words is "one million, one hundred eighty-nine thousand, eight hundred eighty-seven".