1581248 has 28 divisors (see below), whose sum is σ = 3243072. Its totient is φ = 764160.

The previous prime is 1581211. The next prime is 1581257. The reversal of 1581248 is 8421851.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1581248.

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 3 ways as a sum of consecutive naturals, for example, 1586 + ... + 2382.

It is an arithmetic number, because the mean of its divisors is an integer number (115824).

2^1581248 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 1581248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621536).

1581248 is an abundant number, since it is smaller than the sum of its proper divisors (1661824).

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

1581248 is an equidigital number, since it uses as much as digits as its factorization.

1581248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 830 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 1581248 is about 1257.4768387529. The cubic root of 1581248 is about 116.5019862494.

The spelling of 1581248 in words is "one million, five hundred eighty-one thousand, two hundred forty-eight".