1280655 has 24 divisors (see below), whose sum is σ = 2246400. Its totient is φ = 674880.

The previous prime is 1280651. The next prime is 1280659. The reversal of 1280655 is 5560821.

1280655 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 655 = 666.

It is an interprime number because it is at equal distance from previous prime (1280651) and next prime (1280659).

It is not a de Polignac number, because 1280655 - 2² = 1280651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6610 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (93600).

2^1280655 is an apocalyptic number.

1280655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1280655 is a deficient number, since it is larger than the sum of its proper divisors (965745).

1280655 is a wasteful number, since it uses less digits than its factorization.

1280655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1280655 is about 1131.6602847145. The cubic root of 1280655 is about 108.5952217508.

The spelling of 1280655 in words is "one million, two hundred eighty thousand, six hundred fifty-five".