1989125 has 8 divisors (see below), whose sum is σ = 2482584. Its totient is φ = 1591200.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989125 is 5219891.

It can be written as a sum of positive squares in 4 ways, for example, as 3844 + 1985281 = 62^2 + 1409^2 .

It is not a de Polignac number, because 1989125 - 2¹⁰ = 1988101 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7832 + ... + 8081.

It is an arithmetic number, because the mean of its divisors is an integer number (310323).

2^1989125 is an apocalyptic number.

It is an amenable number.

1989125 is a deficient number, since it is larger than the sum of its proper divisors (493459).

1989125 is an equidigital number, since it uses as much as digits as its factorization.

1989125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15928 (or 15918 counting only the distinct ones).

The product of its digits is 6480, while the sum is 35.

The square root of 1989125 is about 1410.3634283404. The cubic root of 1989125 is about 125.7633291406.

The spelling of 1989125 in words is "one million, nine hundred eighty-nine thousand, one hundred twenty-five".