2181528 has 48 divisors (see below), whose sum is σ = 6060600. Its totient is φ = 708480.

The previous prime is 2181503. The next prime is 2181539. The reversal of 2181528 is 8251812.

It is a Cunningham number, because it is equal to 1477²-1.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2583 + ... + 3321.

2^2181528 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 2181528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3030300).

2181528 is an abundant number, since it is smaller than the sum of its proper divisors (3879072).

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

2181528 is a wasteful number, since it uses less digits than its factorization.

2181528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 785 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2181528 is about 1476.9996614759. Note that the first 3 decimals coincide. The cubic root of 2181528 is about 129.6941131674.

The spelling of 2181528 in words is "two million, one hundred eighty-one thousand, five hundred twenty-eight".