2606639 has 4 divisors (see below), whose sum is σ = 2979024. Its totient is φ = 2234256.

The previous prime is 2606633. The next prime is 2606651. The reversal of 2606639 is 9366062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2606639 is a prime.

It is an Ulam 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 (2606633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186182 + ... + 186195.

It is an arithmetic number, because the mean of its divisors is an integer number (744756).

2^2606639 is an apocalyptic number.

2606639 is a deficient number, since it is larger than the sum of its proper divisors (372385).

2606639 is an equidigital number, since it uses as much as digits as its factorization.

2606639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372384.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 2606639 is about 1614.5089036608. The cubic root of 2606639 is about 137.6238267454.

The spelling of 2606639 in words is "two million, six hundred six thousand, six hundred thirty-nine".