1225312 has 36 divisors (see below), whose sum is σ = 2676996. Its totient is φ = 547520.

The previous prime is 1225303. The next prime is 1225319. The reversal of 1225312 is 2135221.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20739 + ... + 20797.

It is an arithmetic number, because the mean of its divisors is an integer number (74361).

2^1225312 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 1225312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338498).

1225312 is an abundant number, since it is smaller than the sum of its proper divisors (1451684).

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

1225312 is an equidigital number, since it uses as much as digits as its factorization.

1225312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 72 counting only the distinct ones).

The product of its digits is 120, while the sum is 16.

The square root of 1225312 is about 1106.9381193183. The cubic root of 1225312 is about 107.0078312608.

Subtracting 1225312 from its reverse (2135221), we obtain a palindrome (909909).

The spelling of 1225312 in words is "one million, two hundred twenty-five thousand, three hundred twelve".