1005775 has 6 divisors (see below), whose sum is σ = 1247192. Its totient is φ = 804600.

The previous prime is 1005761. The next prime is 1005821. The reversal of 1005775 is 5775001.

It is not a de Polignac number, because 1005775 - 2⁷ = 1005647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 40231 = 1005775 / (1 + 0 + 0 + 5 + 7 + 7 + 5).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 20091 + ... + 20140.

2^1005775 is an apocalyptic number.

1005775 is a deficient number, since it is larger than the sum of its proper divisors (241417).

1005775 is an equidigital number, since it uses as much as digits as its factorization.

1005775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40241 (or 40236 counting only the distinct ones).

The product of its (nonzero) digits is 1225, while the sum is 25.

The square root of 1005775 is about 1002.8833431661. The cubic root of 1005775 is about 100.1921306218.

The spelling of 1005775 in words is "one million, five thousand, seven hundred seventy-five".