1256287 has 8 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 1217304.

The previous prime is 1256279. The next prime is 1256303. The reversal of 1256287 is 7826521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256287 - 2³ = 1256279 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹² + 5⁷ + 6⁵ + 2²⁰ + 8² + 7⁶ .

It is a Duffinian number.

1256287 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6214 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2^1256287 is an apocalyptic number.

1256287 is a deficient number, since it is larger than the sum of its proper divisors (39713).

1256287 is a wasteful number, since it uses less digits than its factorization.

1256287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365.

The product of its digits is 6720, while the sum is 31.

The square root of 1256287 is about 1120.8420941417. The cubic root of 1256287 is about 107.9020316430.

The spelling of 1256287 in words is "one million, two hundred fifty-six thousand, two hundred eighty-seven".