2256387 has 16 divisors (see below), whose sum is σ = 3467520. Its totient is φ = 1278432.

The previous prime is 2256379. The next prime is 2256389. The reversal of 2256387 is 7836522.

It is not a de Polignac number, because 2256387 - 2³ = 2256379 is a prime.

It is a d-powerful number, because it can be written as 2¹⁸ + 2¹⁸ + 5² + 6⁸ + 3⁹ + 8⁵ + 7 .

2256387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2256389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2533 + ... + 3305.

It is an arithmetic number, because the mean of its divisors is an integer number (216720).

2^2256387 is an apocalyptic number.

2256387 is a deficient number, since it is larger than the sum of its proper divisors (1211133).

2256387 is a wasteful number, since it uses less digits than its factorization.

2256387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 20160, while the sum is 33.

The square root of 2256387 is about 1502.1274912603. The cubic root of 2256387 is about 131.1609427601.

The spelling of 2256387 in words is "two million, two hundred fifty-six thousand, three hundred eighty-seven".