1591128 has 144 divisors (see below), whose sum is σ = 5601960. Its totient is φ = 403200.

The previous prime is 1591127. The next prime is 1591141. The reversal of 1591128 is 8211951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591127) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38788 + ... + 38828.

2^1591128 is an apocalyptic number.

1591128 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 1591128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2800980).

1591128 is an abundant number, since it is smaller than the sum of its proper divisors (4010832).

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

1591128 is a wasteful number, since it uses less digits than its factorization.

1591128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 64 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1591128 is about 1261.3992230852. The cubic root of 1591128 is about 116.7441263378.

The spelling of 1591128 in words is "one million, five hundred ninety-one thousand, one hundred twenty-eight".