2045556 has 18 divisors (see below), whose sum is σ = 5170802. Its totient is φ = 681840.

The previous prime is 2045543. The next prime is 2045557. The reversal of 2045556 is 6555402.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 396900 = 1284^2 + 630^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045557) 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 5 ways as a sum of consecutive naturals, for example, 28375 + ... + 28446.

2^2045556 is an apocalyptic number.

It is an amenable number.

2045556 is an abundant number, since it is smaller than the sum of its proper divisors (3125246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2045556 is a wasteful number, since it uses less digits than its factorization.

2045556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56831 (or 56826 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2045556 is about 1430.2293522369. The cubic root of 2045556 is about 126.9415483183.

It can be divided in two parts, 2045 and 556, that added together give a square (2601 = 51²).

The spelling of 2045556 in words is "two million, forty-five thousand, five hundred fifty-six".