1280685 has 16 divisors (see below), whose sum is σ = 2342016. Its totient is φ = 585408.

The previous prime is 1280677. The next prime is 1280693. The reversal of 1280685 is 5860821.

It is an interprime number because it is at equal distance from previous prime (1280677) and next prime (1280693).

It is not a de Polignac number, because 1280685 - 2³ = 1280677 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5994 + ... + 6203.

It is an arithmetic number, because the mean of its divisors is an integer number (146376).

2^1280685 is an apocalyptic number.

1280685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280685 is a deficient number, since it is larger than the sum of its proper divisors (1061331).

1280685 is a wasteful number, since it uses less digits than its factorization.

1280685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12212.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1280685 is about 1131.6735394980. The cubic root of 1280685 is about 108.5960697105.

The spelling of 1280685 in words is "one million, two hundred eighty thousand, six hundred eighty-five".