1278655 has 24 divisors (see below), whose sum is σ = 1896048. Its totient is φ = 822528.

The previous prime is 1278637. The next prime is 1278659. The reversal of 1278655 is 5568721.

It is not a de Polignac number, because 1278655 - 2⁵ = 1278623 is a prime.

Its product of digits (16800) is a multiple of the sum of its prime divisors (336).

It is a self number, because there is not a number n which added to its sum of digits gives 1278655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4012 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (79002).

2^1278655 is an apocalyptic number.

1278655 is a deficient number, since it is larger than the sum of its proper divisors (617393).

1278655 is a wasteful number, since it uses less digits than its factorization.

1278655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 336 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The square root of 1278655 is about 1130.7762820293. The cubic root of 1278655 is about 108.5386612138.

The spelling of 1278655 in words is "one million, two hundred seventy-eight thousand, six hundred fifty-five".