2181552 has 40 divisors (see below), whose sum is σ = 5761536. Its totient is φ = 710976.

The previous prime is 2181551. The next prime is 2181577. The reversal of 2181552 is 2551812.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2181551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1773 + ... + 2739.

2^2181552 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 2181552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2880768).

2181552 is an abundant number, since it is smaller than the sum of its proper divisors (3579984).

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

2181552 is a wasteful number, since it uses less digits than its factorization.

2181552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1019 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 2181552 is about 1477.0077860323. The cubic root of 2181552 is about 129.6945887740.

It can be divided in two parts, 218 and 1552, that added together give a triangular number (1770 = T₅₉).

The spelling of 2181552 in words is "two million, one hundred eighty-one thousand, five hundred fifty-two".