1805725 has 6 divisors (see below), whose sum is σ = 2239130. Its totient is φ = 1444560.

The previous prime is 1805701. The next prime is 1805729. The reversal of 1805725 is 5275081.

It can be written as a sum of positive squares in 3 ways, for example, as 4761 + 1800964 = 69^2 + 1342^2 .

It is not a de Polignac number, because 1805725 - 2⁷ = 1805597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1805693 and 1805702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805729) 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, 36090 + ... + 36139.

2^1805725 is an apocalyptic number.

It is an amenable number.

1805725 is a deficient number, since it is larger than the sum of its proper divisors (433405).

1805725 is an equidigital number, since it uses as much as digits as its factorization.

1805725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72239 (or 72234 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1805725 is about 1343.7726742273. The cubic root of 1805725 is about 121.7728686345.

The spelling of 1805725 in words is "one million, eight hundred five thousand, seven hundred twenty-five".