1321493328 has 120 divisors (see below), whose sum is σ = 3798194400. Its totient is φ = 428758272.

The previous prime is 1321493321. The next prime is 1321493333. The reversal of 1321493328 is 8233941231.

1321493328 is a `hidden beast` number, since 1 + 321 + 4 + 9 + 3 + 328 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1321493292 and 1321493301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321493321) 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 23 ways as a sum of consecutive naturals, for example, 925351 + ... + 926777.

It is an arithmetic number, because the mean of its divisors is an integer number (31651620).

Almost surely, 2^1321493328 is an apocalyptic number.

1321493328 is a gapful number since it is divisible by the number (18) 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 1321493328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1899097200).

1321493328 is an abundant number, since it is smaller than the sum of its proper divisors (2476701072).

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

1321493328 is a wasteful number, since it uses less digits than its factorization.

1321493328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1600 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1321493328 is about 36352.3496902195. The cubic root of 1321493328 is about 1097.3748220236.

The spelling of 1321493328 in words is "one billion, three hundred twenty-one million, four hundred ninety-three thousand, three hundred twenty-eight".