1989118 has 4 divisors (see below), whose sum is σ = 2983680. Its totient is φ = 994558.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989118 is 8119891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8119891 = 13 ⋅624607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497278 + ... + 497281.

It is an arithmetic number, because the mean of its divisors is an integer number (745920).

2^1989118 is an apocalyptic number.

1989118 is a deficient number, since it is larger than the sum of its proper divisors (994562).

1989118 is an equidigital number, since it uses as much as digits as its factorization.

1989118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994561.

The product of its digits is 5184, while the sum is 37.

The square root of 1989118 is about 1410.3609467083. The cubic root of 1989118 is about 125.7631816143.

It can be divided in two parts, 198 and 9118, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 1989118 in words is "one million, nine hundred eighty-nine thousand, one hundred eighteen".