1225865 has 4 divisors (see below), whose sum is σ = 1471044. Its totient is φ = 980688.

The previous prime is 1225849. The next prime is 1225871. The reversal of 1225865 is 5685221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 283024 + 942841 = 532^2 + 971^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225865 - 2⁴ = 1225849 is a prime.

It is a Duffinian 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, 122582 + ... + 122591.

It is an arithmetic number, because the mean of its divisors is an integer number (367761).

2^1225865 is an apocalyptic number.

It is an amenable number.

1225865 is a deficient number, since it is larger than the sum of its proper divisors (245179).

1225865 is an equidigital number, since it uses as much as digits as its factorization.

1225865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245178.

The product of its digits is 4800, while the sum is 29.

The square root of 1225865 is about 1107.1878792689. The cubic root of 1225865 is about 107.0239268703.

The spelling of 1225865 in words is "one million, two hundred twenty-five thousand, eight hundred sixty-five".