2181330 has 40 divisors (see below), whose sum is σ = 5867532. Its totient is φ = 581472.

The previous prime is 2181329. The next prime is 2181331. The reversal of 2181330 is 331812.

It is an interprime number because it is at equal distance from previous prime (2181329) and next prime (2181331).

It can be written as a sum of positive squares in 2 ways, for example, as 2152089 + 29241 = 1467^2 + 171^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2181331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 537 + ... + 2156.

2^2181330 is an apocalyptic number.

2181330 is an abundant number, since it is smaller than the sum of its proper divisors (3686202).

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

2181330 is a wasteful number, since it uses less digits than its factorization.

2181330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712 (or 2703 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2181330 is about 1476.9326321806. The cubic root of 2181330 is about 129.6901892799.

The spelling of 2181330 in words is "two million, one hundred eighty-one thousand, three hundred thirty".