2155556 has 12 divisors (see below), whose sum is σ = 4062492. Its totient is φ = 994848.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155556 is 6555512.

It can be written as a sum of positive squares in 2 ways, for example, as 240100 + 1915456 = 490^2 + 1384^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20675 + ... + 20778.

It is an arithmetic number, because the mean of its divisors is an integer number (338541).

2^2155556 is an apocalyptic number.

2155556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2155556 is a deficient number, since it is larger than the sum of its proper divisors (1906936).

2155556 is a wasteful number, since it uses less digits than its factorization.

2155556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41470 (or 41468 counting only the distinct ones).

The product of its digits is 7500, while the sum is 29.

The square root of 2155556 is about 1468.1811877285. The cubic root of 2155556 is about 129.1773695375.

The spelling of 2155556 in words is "two million, one hundred fifty-five thousand, five hundred fifty-six".