1280825 has 24 divisors (see below), whose sum is σ = 1958208. Its totient is φ = 809280.

The previous prime is 1280821. The next prime is 1280833. The reversal of 1280825 is 5280821.

It is not a de Polignac number, because 1280825 - 2² = 1280821 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1280794 and 1280803.

It is not an unprimeable number, because it can be changed into a prime (1280821) 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, 1994 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (81592).

2^1280825 is an apocalyptic number.

It is an amenable number.

1280825 is a deficient number, since it is larger than the sum of its proper divisors (677383).

1280825 is a wasteful number, since it uses less digits than its factorization.

1280825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 588 counting only the distinct ones).

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

The square root of 1280825 is about 1131.7353931021. The cubic root of 1280825 is about 108.6000266803.

The spelling of 1280825 in words is "one million, two hundred eighty thousand, eight hundred twenty-five".