1827985 has 16 divisors (see below), whose sum is σ = 2317392. Its totient is φ = 1382400.

The previous prime is 1827983. The next prime is 1828003. The reversal of 1827985 is 5897281.

It can be written as a sum of positive squares in 8 ways, for example, as 81 + 1827904 = 9^2 + 1352^2 .

It is not a de Polignac number, because 1827985 - 2¹ = 1827983 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 (1827983) 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 15 ways as a sum of consecutive naturals, for example, 7465 + ... + 7705.

It is an arithmetic number, because the mean of its divisors is an integer number (144837).

2^1827985 is an apocalyptic number.

It is an amenable number.

1827985 is a deficient number, since it is larger than the sum of its proper divisors (489407).

1827985 is a wasteful number, since it uses less digits than its factorization.

1827985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its digits is 40320, while the sum is 40.

The square root of 1827985 is about 1352.0299552895. The cubic root of 1827985 is about 122.2712097782.

The spelling of 1827985 in words is "one million, eight hundred twenty-seven thousand, nine hundred eighty-five".