1243156 has 6 divisors (see below), whose sum is σ = 2175530. Its totient is φ = 621576.

The previous prime is 1243147. The next prime is 1243157. The reversal of 1243156 is 6513421.

It can be written as a sum of positive squares in only one way, i.e., 695556 + 547600 = 834^2 + 740^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155391 + ... + 155398.

2^1243156 is an apocalyptic number.

It is an amenable number.

1243156 is a deficient number, since it is larger than the sum of its proper divisors (932374).

1243156 is a wasteful number, since it uses less digits than its factorization.

1243156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310793 (or 310791 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 1243156 is about 1114.9690578666. The cubic root of 1243156 is about 107.5247752524.

Adding to 1243156 its reverse (6513421), we get a palindrome (7756577).

The spelling of 1243156 in words is "one million, two hundred forty-three thousand, one hundred fifty-six".