2056405 has 16 divisors (see below), whose sum is σ = 2815344. Its totient is φ = 1428480.

The previous prime is 2056403. The next prime is 2056409. The reversal of 2056405 is 5046502.

It can be written as a sum of positive squares in 8 ways, for example, as 463761 + 1592644 = 681^2 + 1262^2 .

It is not a de Polignac number, because 2056405 - 2¹ = 2056403 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 (2056403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 2035.

It is an arithmetic number, because the mean of its divisors is an integer number (175959).

2^2056405 is an apocalyptic number.

It is an amenable number.

2056405 is a deficient number, since it is larger than the sum of its proper divisors (758939).

2056405 is a wasteful number, since it uses less digits than its factorization.

2056405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 2056405 is about 1434.0170849749. The cubic root of 2056405 is about 127.1655723778.

The spelling of 2056405 in words is "two million, fifty-six thousand, four hundred five".