1278225 has 72 divisors (see below), whose sum is σ = 2708160. Its totient is φ = 570240.

The previous prime is 1278217. The next prime is 1278227. The reversal of 1278225 is 5228721.

It is not a de Polignac number, because 1278225 - 2³ = 1278217 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1278227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 55564 + ... + 55586.

2^1278225 is an apocalyptic number.

1278225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278225 is an abundant number, since it is smaller than the sum of its proper divisors (1429935).

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

1278225 is a wasteful number, since it uses less digits than its factorization.

1278225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 63 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 1278225 is about 1130.5861311727. The cubic root of 1278225 is about 108.5264929961.

The spelling of 1278225 in words is "one million, two hundred seventy-eight thousand, two hundred twenty-five".