1284255 has 48 divisors (see below), whose sum is σ = 2655744. Its totient is φ = 583200.

The previous prime is 1284223. The next prime is 1284263. The reversal of 1284255 is 5524821.

It is a happy number.

It is not a de Polignac number, because 1284255 - 2⁵ = 1284223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8430 + ... + 8580.

It is an arithmetic number, because the mean of its divisors is an integer number (55328).

2^1284255 is an apocalyptic number.

1284255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1284255 is the 567-th decagonal number.

1284255 is an abundant number, since it is smaller than the sum of its proper divisors (1371489).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1284255 is an equidigital number, since it uses as much as digits as its factorization.

1284255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1284255 is about 1133.2497518200. The cubic root of 1284255 is about 108.6968825020.

The spelling of 1284255 in words is "one million, two hundred eighty-four thousand, two hundred fifty-five".