1581288 has 32 divisors (see below), whose sum is σ = 4052160. Its totient is φ = 513920.

The previous prime is 1581287. The next prime is 1581299. The reversal of 1581288 is 8821851.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1581287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (126630).

2^1581288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1581288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2026080).

1581288 is an abundant number, since it is smaller than the sum of its proper divisors (2470872).

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

1581288 is a wasteful number, since it uses less digits than its factorization.

1581288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1653 counting only the distinct ones).

The product of its digits is 5120, while the sum is 33.

The square root of 1581288 is about 1257.4927435178. The cubic root of 1581288 is about 116.5029686043.

The spelling of 1581288 in words is "one million, five hundred eighty-one thousand, two hundred eighty-eight".