1225636 has 12 divisors (see below), whose sum is σ = 2162160. Its totient is φ = 607880.

The previous prime is 1225621. The next prime is 1225643. The reversal of 1225636 is 6365221.

It is a self number, because there is not a number n which added to its sum of digits gives 1225636.

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, 646 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^1225636 is an apocalyptic number.

It is an amenable number.

1225636 is a deficient number, since it is larger than the sum of its proper divisors (936524).

1225636 is a wasteful number, since it uses less digits than its factorization.

1225636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474 (or 2472 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 1225636 is about 1107.0844592894. The cubic root of 1225636 is about 107.0172621872.

The spelling of 1225636 in words is "one million, two hundred twenty-five thousand, six hundred thirty-six".