1225644 has 24 divisors (see below), whose sum is σ = 3268608. Its totient is φ = 350160.

The previous prime is 1225643. The next prime is 1225657. The reversal of 1225644 is 4465221.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1225643) 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 7 ways as a sum of consecutive naturals, for example, 7212 + ... + 7379.

It is an arithmetic number, because the mean of its divisors is an integer number (136192).

2^1225644 is an apocalyptic number.

1225644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1225644 is an abundant number, since it is smaller than the sum of its proper divisors (2042964).

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

1225644 is a wasteful number, since it uses less digits than its factorization.

1225644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14605 (or 14603 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 1225644 is about 1107.0880723773. The cubic root of 1225644 is about 107.0174950285.

The spelling of 1225644 in words is "one million, two hundred twenty-five thousand, six hundred forty-four".