2057805 has 20 divisors (see below), whose sum is σ = 3689532. Its totient is φ = 1097280.

The previous prime is 2057791. The next prime is 2057807. The reversal of 2057805 is 5087502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 492804 + 1565001 = 702^2 + 1251^2 .

It is not a de Polignac number, because 2057805 - 2¹³ = 2049613 is a prime.

It is a super-2 number, since 2×2057805² = 8469122836050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

2057805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057807) 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 19 ways as a sum of consecutive naturals, for example, 2136 + ... + 2945.

2^2057805 is an apocalyptic number.

It is an amenable number.

2057805 is a deficient number, since it is larger than the sum of its proper divisors (1631727).

2057805 is an equidigital number, since it uses as much as digits as its factorization.

2057805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098 (or 5089 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 2057805 is about 1434.5051411550. The cubic root of 2057805 is about 127.1944239279.

The spelling of 2057805 in words is "two million, fifty-seven thousand, eight hundred five".