1280885 has 16 divisors (see below), whose sum is σ = 1646400. Its totient is φ = 953856.

The previous prime is 1280869. The next prime is 1280887. The reversal of 1280885 is 5880821.

1280885 = 121² + 122² + ... + 177².

It is a cyclic number.

It is not a de Polignac number, because 1280885 - 2⁴ = 1280869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9146 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (102900).

2^1280885 is an apocalyptic number.

It is an amenable number.

1280885 is a deficient number, since it is larger than the sum of its proper divisors (365515).

1280885 is a wasteful number, since it uses less digits than its factorization.

1280885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 1280885 is about 1131.7619007547. The cubic root of 1280885 is about 108.6017224363.

The spelling of 1280885 in words is "one million, two hundred eighty thousand, eight hundred eighty-five".