1256217 has 4 divisors (see below), whose sum is σ = 1674960. Its totient is φ = 837476.

The previous prime is 1256209. The next prime is 1256231. The reversal of 1256217 is 7126521.

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 1256217 - 2³ = 1256209 is a prime.

It is a D-number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209367 + ... + 209372.

It is an arithmetic number, because the mean of its divisors is an integer number (418740).

2^1256217 is an apocalyptic number.

It is an amenable number.

1256217 is a deficient number, since it is larger than the sum of its proper divisors (418743).

1256217 is an equidigital number, since it uses as much as digits as its factorization.

1256217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418742.

The product of its digits is 840, while the sum is 24.

The square root of 1256217 is about 1120.8108671850. The cubic root of 1256217 is about 107.9000275143.

The spelling of 1256217 in words is "one million, two hundred fifty-six thousand, two hundred seventeen".