1989725 has 6 divisors (see below), whose sum is σ = 2467290. Its totient is φ = 1591760.

The previous prime is 1989721. The next prime is 1989769. The reversal of 1989725 is 5279891.

It can be written as a sum of positive squares in 3 ways, for example, as 21316 + 1968409 = 146^2 + 1403^2 .

It is not a de Polignac number, because 1989725 - 2² = 1989721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39770 + ... + 39819.

It is an arithmetic number, because the mean of its divisors is an integer number (411215).

2^1989725 is an apocalyptic number.

It is an amenable number.

1989725 is a deficient number, since it is larger than the sum of its proper divisors (477565).

1989725 is an equidigital number, since it uses as much as digits as its factorization.

1989725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79599 (or 79594 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The square root of 1989725 is about 1410.5761234333. The cubic root of 1989725 is about 125.7759729599.

The spelling of 1989725 in words is "one million, nine hundred eighty-nine thousand, seven hundred twenty-five".