1491784320 has 256 divisors, whose sum is σ = 5212771200. Its totient is φ = 360628224.

The previous prime is 1491784319. The next prime is 1491784351. The reversal of 1491784320 is 234871941.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 1472134 + ... + 1473146.

Almost surely, 2^1491784320 is an apocalyptic number.

1491784320 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 1491784320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2606385600).

1491784320 is an abundant number, since it is smaller than the sum of its proper divisors (3720986880).

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

1491784320 is a wasteful number, since it uses less digits than its factorization.

1491784320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1491784320 is about 38623.6238589804. The cubic root of 1491784320 is about 1142.6205029095.

The spelling of 1491784320 in words is "one billion, four hundred ninety-one million, seven hundred eighty-four thousand, three hundred twenty".