2185638 has 32 divisors (see below), whose sum is σ = 5381376. Its totient is φ = 576288.

The previous prime is 2185637. The next prime is 2185649. The reversal of 2185638 is 8365812.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2185599 and 2185608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1456 + ... + 2547.

It is an arithmetic number, because the mean of its divisors is an integer number (168168).

2^2185638 is an apocalyptic number.

2185638 is an abundant number, since it is smaller than the sum of its proper divisors (3195738).

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

2185638 is a wasteful number, since it uses less digits than its factorization.

2185638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028.

The product of its digits is 11520, while the sum is 33.

The square root of 2185638 is about 1478.3903408775. The cubic root of 2185638 is about 129.7755099993.

The spelling of 2185638 in words is "two million, one hundred eighty-five thousand, six hundred thirty-eight".