1321272732 has 48 divisors (see below), whose sum is σ = 3328809120. Its totient is φ = 405481728.

The previous prime is 1321272713. The next prime is 1321272737. The reversal of 1321272732 is 2372721231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321272732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321272737) by changing a digit.

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, 49798 + ... + 71570.

It is an arithmetic number, because the mean of its divisors is an integer number (69350190).

Almost surely, 2^1321272732 is an apocalyptic number.

1321272732 is a gapful number since it is divisible by the number (12) 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 1321272732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1664404560).

1321272732 is an abundant number, since it is smaller than the sum of its proper divisors (2007536388).

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

1321272732 is a wasteful number, since it uses less digits than its factorization.

1321272732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22182 (or 22180 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 1321272732 is about 36349.3154268413. The cubic root of 1321272732 is about 1097.3137572765.

Adding to 1321272732 its reverse (2372721231), we get a palindrome (3693993963).

The spelling of 1321272732 in words is "one billion, three hundred twenty-one million, two hundred seventy-two thousand, seven hundred thirty-two".