1243556 has 6 divisors (see below), whose sum is σ = 2176230. Its totient is φ = 621776.

The previous prime is 1243547. The next prime is 1243559. The reversal of 1243556 is 6553421.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 341056 = 950^2 + 584^2 .

It is not an unprimeable number, because it can be changed into a prime (1243559) 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 as a sum of consecutive naturals, namely, 155441 + ... + 155448.

It is an arithmetic number, because the mean of its divisors is an integer number (362705).

2^1243556 is an apocalyptic number.

It is an amenable number.

1243556 is a deficient number, since it is larger than the sum of its proper divisors (932674).

1243556 is a wasteful number, since it uses less digits than its factorization.

1243556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310893 (or 310891 counting only the distinct ones).

The product of its digits is 3600, while the sum is 26.

The square root of 1243556 is about 1115.1484206149. The cubic root of 1243556 is about 107.5363064675.

Adding to 1243556 its reverse (6553421), we get a palindrome (7796977).

The spelling of 1243556 in words is "one million, two hundred forty-three thousand, five hundred fifty-six".