1242856 has 16 divisors (see below), whose sum is σ = 2342340. Its totient is φ = 618240.

The previous prime is 1242841. The next prime is 1242859. The reversal of 1242856 is 6582421.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 54756 = 1090^2 + 234^2 .

It is a d-powerful number, because it can be written as 1 + 2¹⁶ + 4⁴ + 2¹⁹ + 8⁶ + 5⁸ + 6 .

It is not an unprimeable number, because it can be changed into a prime (1242859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466 + ... + 2926.

2^1242856 is an apocalyptic number.

It is an amenable number.

1242856 is a deficient number, since it is larger than the sum of its proper divisors (1099484).

1242856 is a wasteful number, since it uses less digits than its factorization.

1242856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 800 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1242856 is about 1114.8345168679. The cubic root of 1242856 is about 107.5161252176.

The spelling of 1242856 in words is "one million, two hundred forty-two thousand, eight hundred fifty-six".