2605989 has 4 divisors (see below), whose sum is σ = 3474656. Its totient is φ = 1737324.

The previous prime is 2605987. The next prime is 2605991. The reversal of 2605989 is 9895062.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (2605987) and next prime (2605991).

It is not a de Polignac number, because 2605989 - 2¹ = 2605987 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605987) 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, 434329 + ... + 434334.

It is an arithmetic number, because the mean of its divisors is an integer number (868664).

2^2605989 is an apocalyptic number.

It is an amenable number.

2605989 is a deficient number, since it is larger than the sum of its proper divisors (868667).

2605989 is an equidigital number, since it uses as much as digits as its factorization.

2605989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868666.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 2605989 is about 1614.3075915079. The cubic root of 2605989 is about 137.6123863523.

The spelling of 2605989 in words is "two million, six hundred five thousand, nine hundred eighty-nine".