1280257 has 4 divisors (see below), whose sum is σ = 1396656. Its totient is φ = 1163860.

The previous prime is 1280231. The next prime is 1280267. The reversal of 1280257 is 7520821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1280257 - 2⁷ = 1280129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58183 + ... + 58204.

It is an arithmetic number, because the mean of its divisors is an integer number (349164).

2^1280257 is an apocalyptic number.

It is an amenable number.

1280257 is a deficient number, since it is larger than the sum of its proper divisors (116399).

1280257 is a wasteful number, since it uses less digits than its factorization.

1280257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116398.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1280257 is about 1131.4844232246. The cubic root of 1280257 is about 108.5839708997.

The spelling of 1280257 in words is "one million, two hundred eighty thousand, two hundred fifty-seven".