1985725 has 18 divisors (see below), whose sum is σ = 2866074. Its totient is φ = 1360800.

The previous prime is 1985713. The next prime is 1985729. The reversal of 1985725 is 5275891.

It can be written as a sum of positive squares in 3 ways, for example, as 290521 + 1695204 = 539^2 + 1302^2 .

It is not a de Polignac number, because 1985725 - 2⁹ = 1985213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985729) 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 17 ways as a sum of consecutive naturals, for example, 415 + ... + 2035.

2^1985725 is an apocalyptic number.

It is an amenable number.

1985725 is a deficient number, since it is larger than the sum of its proper divisors (880349).

1985725 is a wasteful number, since it uses less digits than its factorization.

1985725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645 (or 1633 counting only the distinct ones).

The product of its digits is 25200, while the sum is 37.

The square root of 1985725 is about 1409.1575497438. The cubic root of 1985725 is about 125.6916327616.

The spelling of 1985725 in words is "one million, nine hundred eighty-five thousand, seven hundred twenty-five".