2785638 has 16 divisors (see below), whose sum is σ = 5624640. Its totient is φ = 919656.

The previous prime is 2785633. The next prime is 2785639. The reversal of 2785638 is 8365872.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2785596 and 2785605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785631) 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, 1528 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

2^2785638 is an apocalyptic number.

2785638 is an abundant number, since it is smaller than the sum of its proper divisors (2839002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2785638 is a wasteful number, since it uses less digits than its factorization.

2785638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4451.

The product of its digits is 80640, while the sum is 39.

The square root of 2785638 is about 1669.0230675458. The cubic root of 2785638 is about 140.7045773797.

The spelling of 2785638 in words is "two million, seven hundred eighty-five thousand, six hundred thirty-eight".