1278842 has 16 divisors (see below), whose sum is σ = 2102760. Its totient is φ = 580608.

The previous prime is 1278839. The next prime is 1278857. The reversal of 1278842 is 2488721.

It can be written as a sum of positive squares in 4 ways, for example, as 1256641 + 22201 = 1121^2 + 149^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1278799 and 1278808.

It is an unprimeable number.

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, 338 + ... + 1634.

2^1278842 is an apocalyptic number.

1278842 is a deficient number, since it is larger than the sum of its proper divisors (823918).

1278842 is a wasteful number, since it uses less digits than its factorization.

1278842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345.

The product of its digits is 7168, while the sum is 32.

The square root of 1278842 is about 1130.8589655656. The cubic root of 1278842 is about 108.5439521224.

The spelling of 1278842 in words is "one million, two hundred seventy-eight thousand, eight hundred forty-two".