1189989 has 12 divisors (see below), whose sum is σ = 1809600. Its totient is φ = 751464.

The previous prime is 1189967. The next prime is 1189999. The reversal of 1189989 is 9899811.

It is not a de Polignac number, because 1189989 - 2¹¹ = 1187941 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

1189989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3309 + ... + 3650.

It is an arithmetic number, because the mean of its divisors is an integer number (150800).

2^1189989 is an apocalyptic number.

1189989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1189989 is a deficient number, since it is larger than the sum of its proper divisors (619611).

1189989 is a wasteful number, since it uses less digits than its factorization.

1189989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6984 (or 6981 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1189989 is about 1090.8661696102. The cubic root of 1189989 is about 105.9695236937.

It can be divided in two parts, 11 and 89989, that added together give a square (90000 = 300²).

The spelling of 1189989 in words is "one million, one hundred eighty-nine thousand, nine hundred eighty-nine".