2256389 has 2 divisors, whose sum is σ = 2256390. Its totient is φ = 2256388.

The previous prime is 2256379. The next prime is 2256413. The reversal of 2256389 is 9836522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1562500 + 693889 = 1250^2 + 833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2256389 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹⁸ + 2¹⁸ + 5² + 6⁸ + 3⁹ + 8⁵ + 9 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2256349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128194 + 1128195.

It is an arithmetic number, because the mean of its divisors is an integer number (1128195).

2^2256389 is an apocalyptic number.

It is an amenable number.

2256389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256389 is an equidigital number, since it uses as much as digits as its factorization.

2256389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 2256389 is about 1502.1281569826. The cubic root of 2256389 is about 131.1609815126.

The spelling of 2256389 in words is "two million, two hundred fifty-six thousand, three hundred eighty-nine".