1989187 has 6 divisors (see below), whose sum is σ = 2113388. Its totient is φ = 1871904.

The previous prime is 1989161. The next prime is 1989193. The reversal of 1989187 is 7819891.

It is not a de Polignac number, because 1989187 - 2⁷ = 1989059 is a prime.

It is a Duffinian number.

1989187 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1989107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3153 + ... + 3730.

2^1989187 is an apocalyptic number.

1989187 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1989187 is a deficient number, since it is larger than the sum of its proper divisors (124201).

1989187 is an equidigital number, since it uses as much as digits as its factorization.

1989187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6917 (or 6900 counting only the distinct ones).

The product of its digits is 36288, while the sum is 43.

The square root of 1989187 is about 1410.3854083193. The cubic root of 1989187 is about 125.7646357863.

The spelling of 1989187 in words is "one million, nine hundred eighty-nine thousand, one hundred eighty-seven".