1280085 has 16 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 671040.

The previous prime is 1280023. The next prime is 1280101. The reversal of 1280085 is 5800821.

It is not a de Polignac number, because 1280085 - 2¹⁴ = 1263701 is a prime.

It is a Curzon number.

1280085 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216 + ... + 1614.

It is an arithmetic number, because the mean of its divisors is an integer number (130200).

2^1280085 is an apocalyptic number.

1280085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280085 is a deficient number, since it is larger than the sum of its proper divisors (803115).

1280085 is a wasteful number, since it uses less digits than its factorization.

1280085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1280085 is about 1131.4084143226. The cubic root of 1280085 is about 108.5791080012.

The spelling of 1280085 in words is "one million, two hundred eighty thousand, eighty-five".