2256638 has 8 divisors (see below), whose sum is σ = 3399840. Its totient is φ = 1123360.

The previous prime is 2256637. The next prime is 2256673. The reversal of 2256638 is 8366522.

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 2² + 2¹⁶ + 5⁴ + 6⁶ + 6⁶ + 3² + 8⁷ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256637) 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, 1883 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (424980).

2^2256638 is an apocalyptic number.

2256638 is a deficient number, since it is larger than the sum of its proper divisors (1143202).

2256638 is a wasteful number, since it uses less digits than its factorization.

2256638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4962.

The product of its digits is 17280, while the sum is 32.

The square root of 2256638 is about 1502.2110371050. The cubic root of 2256638 is about 131.1658060181.

The spelling of 2256638 in words is "two million, two hundred fifty-six thousand, six hundred thirty-eight".