2056645 has 8 divisors (see below), whose sum is σ = 2534904. Its totient is φ = 1600704.

The previous prime is 2056631. The next prime is 2056661. The reversal of 2056645 is 5466502.

It can be written as a sum of positive squares in 4 ways, for example, as 209764 + 1846881 = 458^2 + 1359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2056645 - 2⁷ = 2056517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5374 + ... + 5743.

It is an arithmetic number, because the mean of its divisors is an integer number (316863).

2^2056645 is an apocalyptic number.

It is an amenable number.

2056645 is a deficient number, since it is larger than the sum of its proper divisors (478259).

2056645 is a wasteful number, since it uses less digits than its factorization.

2056645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2056645 is about 1434.1007635449. The cubic root of 2056645 is about 127.1705192876.

It can be divided in two parts, 2056 and 645, that added together give a triangular number (2701 = T₇₃).

The spelling of 2056645 in words is "two million, fifty-six thousand, six hundred forty-five".