1280285 has 4 divisors (see below), whose sum is σ = 1536348. Its totient is φ = 1024224.

The previous prime is 1280281. The next prime is 1280291. The reversal of 1280285 is 5820821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5820821 = 19 ⋅306359.

It can be written as a sum of positive squares in 2 ways, for example, as 835396 + 444889 = 914^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280285 - 2² = 1280281 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128024 + ... + 128033.

It is an arithmetic number, because the mean of its divisors is an integer number (384087).

2^1280285 is an apocalyptic number.

It is an amenable number.

1280285 is a deficient number, since it is larger than the sum of its proper divisors (256063).

1280285 is an equidigital number, since it uses as much as digits as its factorization.

1280285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256062.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1280285 is about 1131.4967962836. The cubic root of 1280285 is about 108.5847624931.

The spelling of 1280285 in words is "one million, two hundred eighty thousand, two hundred eighty-five".