2685638 has 8 divisors (see below), whose sum is σ = 4043088. Its totient is φ = 1337944.

The previous prime is 2685629. The next prime is 2685649. The reversal of 2685638 is 8365862.

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁹ + 6³ + 8³ + 5⁵ + 6⁴ + 3¹⁰ + 8⁷ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706 + ... + 2877.

It is an arithmetic number, because the mean of its divisors is an integer number (505386).

2^2685638 is an apocalyptic number.

2685638 is a deficient number, since it is larger than the sum of its proper divisors (1357450).

2685638 is a wasteful number, since it uses less digits than its factorization.

2685638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4878.

The product of its digits is 69120, while the sum is 38.

The square root of 2685638 is about 1638.7916279991. The cubic root of 2685638 is about 139.0003277945. Note that the first 3 decimals are identical.

The spelling of 2685638 in words is "two million, six hundred eighty-five thousand, six hundred thirty-eight".