1225656 has 48 divisors (see below), whose sum is σ = 3439800. Its totient is φ = 393792.

The previous prime is 1225643. The next prime is 1225657. The reversal of 1225656 is 6565221.

1225656 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 656 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225657) 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 in 11 ways as a sum of consecutive naturals, for example, 1795 + ... + 2381.

2^1225656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1719900).

1225656 is an abundant number, since it is smaller than the sum of its proper divisors (2214144).

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

1225656 is a wasteful number, since it uses less digits than its factorization.

1225656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 621 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1225656 is about 1107.0934919870. The cubic root of 1225656 is about 107.0178442886.

It can be divided in two parts, 1225 and 656, that added together give a palindrome (1881).

The spelling of 1225656 in words is "one million, two hundred twenty-five thousand, six hundred fifty-six".