2185990656 has 160 divisors (see below), whose sum is σ = 6222458880. Its totient is φ = 680300544.

The previous prime is 2185990649. The next prime is 2185990657. The reversal of 2185990656 is 6560995812.

It is a junction number, because it is equal to n+sod(n) for n = 2185990599 and 2185990608.

It is not an unprimeable number, because it can be changed into a prime (2185990657) 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, 1518385 + ... + 1519823.

It is an arithmetic number, because the mean of its divisors is an integer number (38890368).

Almost surely, 2^2185990656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2185990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3111229440).

2185990656 is an abundant number, since it is smaller than the sum of its proper divisors (4036468224).

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

2185990656 is a wasteful number, since it uses less digits than its factorization.

2185990656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526 (or 1510 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 51.

The square root of 2185990656 is about 46754.5789843091. The cubic root of 2185990656 is about 1297.8248944898.

The spelling of 2185990656 in words is "two billion, one hundred eighty-five million, nine hundred ninety thousand, six hundred fifty-six".