1581888 has 112 divisors (see below), whose sum is σ = 5266944. Its totient is φ = 407040.

The previous prime is 1581869. The next prime is 1581889. The reversal of 1581888 is 8881851.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14731 + ... + 14837.

2^1581888 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 1581888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2633472).

1581888 is an abundant number, since it is smaller than the sum of its proper divisors (3685056).

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

1581888 is a wasteful number, since it uses less digits than its factorization.

1581888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 130 counting only the distinct ones).

The product of its digits is 20480, while the sum is 39.

The square root of 1581888 is about 1257.7312908567. The cubic root of 1581888 is about 116.5177019402.

The spelling of 1581888 in words is "one million, five hundred eighty-one thousand, eight hundred eighty-eight".