2181730 has 16 divisors (see below), whose sum is σ = 3965760. Its totient is φ = 864112.

The previous prime is 2181719. The next prime is 2181731. The reversal of 2181730 is 371812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181731) 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, 51 + ... + 2089.

It is an arithmetic number, because the mean of its divisors is an integer number (247860).

2^2181730 is an apocalyptic number.

2181730 is a deficient number, since it is larger than the sum of its proper divisors (1784030).

2181730 is a wasteful number, since it uses less digits than its factorization.

2181730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2181730 is about 1477.0680417638. The cubic root of 2181730 is about 129.6981160807.

The spelling of 2181730 in words is "two million, one hundred eighty-one thousand, seven hundred thirty".