2149989 has 4 divisors (see below), whose sum is σ = 2866656. Its totient is φ = 1433324.

The previous prime is 2149937. The next prime is 2149991. The reversal of 2149989 is 9899412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2149989 - 2¹¹ = 2147941 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2149989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2149909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358329 + ... + 358334.

It is an arithmetic number, because the mean of its divisors is an integer number (716664).

2^2149989 is an apocalyptic number.

It is an amenable number.

2149989 is a deficient number, since it is larger than the sum of its proper divisors (716667).

2149989 is an equidigital number, since it uses as much as digits as its factorization.

2149989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716666.

The product of its digits is 46656, while the sum is 42.

The square root of 2149989 is about 1466.2840788879. The cubic root of 2149989 is about 129.0660679540.

The spelling of 2149989 in words is "two million, one hundred forty-nine thousand, nine hundred eighty-nine".