1556906 has 16 divisors (see below), whose sum is σ = 2535624. Its totient is φ = 712704.

The previous prime is 1556897. The next prime is 1556909. The reversal of 1556906 is 6096551.

It can be written as a sum of positive squares in 4 ways, for example, as 1301881 + 255025 = 1141^2 + 505^2 .

It is not an unprimeable number, because it can be changed into a prime (1556909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5930 + ... + 6186.

2^1556906 is an apocalyptic number.

1556906 is a deficient number, since it is larger than the sum of its proper divisors (978718).

1556906 is a wasteful number, since it uses less digits than its factorization.

1556906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 1556906 is about 1247.7603936654. The cubic root of 1556906 is about 115.9010749947.

The spelling of 1556906 in words is "one million, five hundred fifty-six thousand, nine hundred six".