2256866 has 4 divisors (see below), whose sum is σ = 3385302. Its totient is φ = 1128432.

The previous prime is 2256857. The next prime is 2256887. The reversal of 2256866 is 6686522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6686522 = 2 ⋅3343261.

It can be written as a sum of positive squares in only one way, i.e., 2163841 + 93025 = 1471^2 + 305^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564215 + ... + 564218.

2^2256866 is an apocalyptic number.

2256866 is a deficient number, since it is larger than the sum of its proper divisors (1128436).

2256866 is a wasteful number, since it uses less digits than its factorization.

2256866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128435.

The product of its digits is 34560, while the sum is 35.

The square root of 2256866 is about 1502.2869233272. The cubic root of 2256866 is about 131.1702233263.

The spelling of 2256866 in words is "two million, two hundred fifty-six thousand, eight hundred sixty-six".