1225628 has 6 divisors (see below), whose sum is σ = 2144856. Its totient is φ = 612812.

The previous prime is 1225621. The next prime is 1225643. The reversal of 1225628 is 8265221.

It is a junction number, because it is equal to n+sod(n) for n = 1225597 and 1225606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153200 + ... + 153207.

It is an arithmetic number, because the mean of its divisors is an integer number (357476).

2^1225628 is an apocalyptic number.

It is an amenable number.

1225628 is a deficient number, since it is larger than the sum of its proper divisors (919228).

1225628 is a wasteful number, since it uses less digits than its factorization.

1225628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306411 (or 306409 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 1225628 is about 1107.0808461897. The cubic root of 1225628 is about 107.0170293448.

The spelling of 1225628 in words is "one million, two hundred twenty-five thousand, six hundred twenty-eight".