2185705998 has 32 divisors (see below), whose sum is σ = 5551000320. Its totient is φ = 624487320.

The previous prime is 2185705993. The next prime is 2185705999. The reversal of 2185705998 is 8995075812.

2185705998 is a `hidden beast` number, since 2 + 18 + 570 + 59 + 9 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185705993) 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 15 ways as a sum of consecutive naturals, for example, 2890768 + ... + 2891523.

It is an arithmetic number, because the mean of its divisors is an integer number (173468760).

Almost surely, 2^2185705998 is an apocalyptic number.

2185705998 is an abundant number, since it is smaller than the sum of its proper divisors (3365294322).

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

2185705998 is a wasteful number, since it uses less digits than its factorization.

2185705998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782309 (or 5782303 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 54.

The square root of 2185705998 is about 46751.5347127771. The cubic root of 2185705998 is about 1297.7685581288.

The spelling of 2185705998 in words is "two billion, one hundred eighty-five million, seven hundred five thousand, nine hundred ninety-eight".