2181489 has 8 divisors (see below), whose sum is σ = 2944032. Its totient is φ = 1436640.

The previous prime is 2181469. The next prime is 2181503. The reversal of 2181489 is 9841812.

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

It is not a de Polignac number, because 2181489 - 2⁸ = 2181233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2181419) 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, 4132 + ... + 4629.

It is an arithmetic number, because the mean of its divisors is an integer number (368004).

2^2181489 is an apocalyptic number.

It is an amenable number.

2181489 is a deficient number, since it is larger than the sum of its proper divisors (762543).

2181489 is an equidigital number, since it uses as much as digits as its factorization.

2181489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8847.

The product of its digits is 4608, while the sum is 33.

The square root of 2181489 is about 1476.9864589765. The cubic root of 2181489 is about 129.6933402992.

The spelling of 2181489 in words is "two million, one hundred eighty-one thousand, four hundred eighty-nine".