1321228460 has 48 divisors (see below), whose sum is σ = 2960680800. Its totient is φ = 493807104.

The previous prime is 1321228459. The next prime is 1321228471. The reversal of 1321228460 is 648221231.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3926 + ... + 51554.

It is an arithmetic number, because the mean of its divisors is an integer number (61680850).

Almost surely, 2^1321228460 is an apocalyptic number.

1321228460 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 1321228460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1480340400).

1321228460 is an abundant number, since it is smaller than the sum of its proper divisors (1639452340).

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

1321228460 is a wasteful number, since it uses less digits than its factorization.

1321228460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47730 (or 47728 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1321228460 is about 36348.7064419079. The cubic root of 1321228460 is about 1097.3015012106.

Adding to 1321228460 its reverse (648221231), we get a palindrome (1969449691).

The spelling of 1321228460 in words is "one billion, three hundred twenty-one million, two hundred twenty-eight thousand, four hundred sixty".