1225866 has 8 divisors (see below), whose sum is σ = 2451744. Its totient is φ = 408620.

The previous prime is 1225849. The next prime is 1225871. The reversal of 1225866 is 6685221.

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

1225866 is an admirable number.

It is a Curzon 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, 102150 + ... + 102161.

It is an arithmetic number, because the mean of its divisors is an integer number (306468).

2^1225866 is an apocalyptic number.

1225866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1225866 is a wasteful number, since it uses less digits than its factorization.

1225866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204316.

The product of its digits is 5760, while the sum is 30.

The square root of 1225866 is about 1107.1883308634. The cubic root of 1225866 is about 107.0239559719.

It can be divided in two parts, 12 and 25866, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 1225866 in words is "one million, two hundred twenty-five thousand, eight hundred sixty-six".