2608639 has 6 divisors (see below), whose sum is σ = 2867480. Its totient is φ = 2371380.

The previous prime is 2608631. The next prime is 2608649. The reversal of 2608639 is 9368062.

It is a happy number.

It is not a de Polignac number, because 2608639 - 2³ = 2608631 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2608631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10659 + ... + 10900.

2^2608639 is an apocalyptic number.

2608639 is a deficient number, since it is larger than the sum of its proper divisors (258841).

2608639 is a wasteful number, since it uses less digits than its factorization.

2608639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21581 (or 21570 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2608639 is about 1615.1281682888. The cubic root of 2608639 is about 137.6590160302.

It can be divided in two parts, 260 and 8639, that multiplied together give a triangular number (2246140 = T₂₁₁₉).

The spelling of 2608639 in words is "two million, six hundred eight thousand, six hundred thirty-nine".