1225343420 has 48 divisors (see below), whose sum is σ = 2951847360. Its totient is φ = 418543104.

The previous prime is 1225343381. The next prime is 1225343429. The reversal of 1225343420 is 243435221.

It is a self number, because there is not a number n which added to its sum of digits gives 1225343420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225343429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21392 + ... + 53928.

It is an arithmetic number, because the mean of its divisors is an integer number (61496820).

Almost surely, 2^1225343420 is an apocalyptic number.

1225343420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225343420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475923680).

1225343420 is an abundant number, since it is smaller than the sum of its proper divisors (1726503940).

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

1225343420 is a wasteful number, since it uses less digits than its factorization.

1225343420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32822 (or 32820 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1225343420 is about 35004.9056562077. The cubic root of 1225343420 is about 1070.0874590054.

Adding to 1225343420 its reverse (243435221), we get a palindrome (1468778641).

The spelling of 1225343420 in words is "one billion, two hundred twenty-five million, three hundred forty-three thousand, four hundred twenty".