1280425 has 6 divisors (see below), whose sum is σ = 1587758. Its totient is φ = 1024320.

The previous prime is 1280417. The next prime is 1280431. The reversal of 1280425 is 5240821.

It can be written as a sum of positive squares in 3 ways, for example, as 34969 + 1245456 = 187^2 + 1116^2 .

It is not a de Polignac number, because 1280425 - 2³ = 1280417 is a prime.

It is a Duffinian number.

1280425 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1280396 and 1280405.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25584 + ... + 25633.

2^1280425 is an apocalyptic number.

It is an amenable number.

1280425 is a deficient number, since it is larger than the sum of its proper divisors (307333).

1280425 is an equidigital number, since it uses as much as digits as its factorization.

1280425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51227 (or 51222 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1280425 is about 1131.5586595489. The cubic root of 1280425 is about 108.5887202870.

The spelling of 1280425 in words is "one million, two hundred eighty thousand, four hundred twenty-five".