2181445 has 8 divisors (see below), whose sum is σ = 2991744. Its totient is φ = 1495824.

The previous prime is 2181419. The next prime is 2181449. The reversal of 2181445 is 5441812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181445 - 2¹⁵ = 2148677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181449) 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, 31129 + ... + 31198.

It is an arithmetic number, because the mean of its divisors is an integer number (373968).

2^2181445 is an apocalyptic number.

It is an amenable number.

2181445 is a deficient number, since it is larger than the sum of its proper divisors (810299).

2181445 is an equidigital number, since it uses as much as digits as its factorization.

2181445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62339.

The product of its digits is 1280, while the sum is 25.

The square root of 2181445 is about 1476.9715637073. The cubic root of 2181445 is about 129.6924683344.

The spelling of 2181445 in words is "two million, one hundred eighty-one thousand, four hundred forty-five".