1284256 has 24 divisors (see below), whose sum is σ = 2570400. Its totient is φ = 631488.

The previous prime is 1284223. The next prime is 1284263. The reversal of 1284256 is 6524821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845 + ... + 2443.

It is an arithmetic number, because the mean of its divisors is an integer number (107100).

2^1284256 is an apocalyptic number.

1284256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1284256 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1284256 is an equidigital number, since it uses as much as digits as its factorization.

1284256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 668 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1284256 is about 1133.2501930289. The cubic root of 1284256 is about 108.6969107147.

It can be divided in two parts, 1284 and 256, that added together give a triangular number (1540 = T₅₅).

The spelling of 1284256 in words is "one million, two hundred eighty-four thousand, two hundred fifty-six".