1225123320 has 128 divisors (see below), whose sum is σ = 3780691200. Its totient is φ = 317420544.

The previous prime is 1225123307. The next prime is 1225123327. The reversal of 1225123320 is 233215221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225123327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1201771 + ... + 1202789.

It is an arithmetic number, because the mean of its divisors is an integer number (29536650).

Almost surely, 2^1225123320 is an apocalyptic number.

1225123320 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 1225123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890345600).

1225123320 is an abundant number, since it is smaller than the sum of its proper divisors (2555567880).

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

1225123320 is a wasteful number, since it uses less digits than its factorization.

1225123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1225123320 is about 35001.7616699503. The cubic root of 1225123320 is about 1070.0233843552.

Adding to 1225123320 its reverse (233215221), we get a palindrome (1458338541).

The spelling of 1225123320 in words is "one billion, two hundred twenty-five million, one hundred twenty-three thousand, three hundred twenty".