2689609 has 8 divisors (see below), whose sum is σ = 2910152. Its totient is φ = 2471040.

The previous prime is 2689601. The next prime is 2689613. The reversal of 2689609 is 9069862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 2689600 = 3^2 + 1640^2 .

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

It is not a de Polignac number, because 2689609 - 2³ = 2689601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689601) 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, 3739 + ... + 4399.

It is an arithmetic number, because the mean of its divisors is an integer number (363769).

2^2689609 is an apocalyptic number.

It is an amenable number.

2689609 is a deficient number, since it is larger than the sum of its proper divisors (220543).

2689609 is a wasteful number, since it uses less digits than its factorization.

2689609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 2689609 is about 1640.0027439001. The cubic root of 2689609 is about 139.0688029546.

The spelling of 2689609 in words is "two million, six hundred eighty-nine thousand, six hundred nine".