1278644 has 12 divisors (see below), whose sum is σ = 2246244. Its totient is φ = 636864.

The previous prime is 1278637. The next prime is 1278659. The reversal of 1278644 is 4468721.

It can be written as a sum of positive squares in 2 ways, for example, as 976144 + 302500 = 988^2 + 550^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1278644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064 + ... + 1920.

It is an arithmetic number, because the mean of its divisors is an integer number (187187).

2^1278644 is an apocalyptic number.

It is an amenable number.

1278644 is a deficient number, since it is larger than the sum of its proper divisors (967600).

1278644 is a wasteful number, since it uses less digits than its factorization.

1278644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 1232 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 1278644 is about 1130.7714181036. The cubic root of 1278644 is about 108.5383499678.

The spelling of 1278644 in words is "one million, two hundred seventy-eight thousand, six hundred forty-four".