1591328 has 18 divisors (see below), whose sum is σ = 3147039. Its totient is φ = 792096.

The previous prime is 1591313. The next prime is 1591339. The reversal of 1591328 is 8231951.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 795664 = 892^2 + 892^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=892.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1591328.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7025 + ... + 7247.

2^1591328 is an apocalyptic number.

It is an amenable number.

1591328 is a deficient number, since it is larger than the sum of its proper divisors (1555711).

1591328 is an frugal number, since it uses more digits than its factorization.

1591328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 225 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 1591328 is about 1261.4784976368. The cubic root of 1591328 is about 116.7490175946.

The spelling of 1591328 in words is "one million, five hundred ninety-one thousand, three hundred twenty-eight".