206138856 has 128 divisors (see below), whose sum is σ = 646364160. Its totient is φ = 53222400.

The previous prime is 206138843. The next prime is 206138893. The reversal of 206138856 is 658831602.

It is a happy number.

206138856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 611520 + ... + 611856.

It is an arithmetic number, because the mean of its divisors is an integer number (5049720).

Almost surely, 2^206138856 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 206138856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323182080).

206138856 is an abundant number, since it is smaller than the sum of its proper divisors (440225304).

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

206138856 is a wasteful number, since it uses less digits than its factorization.

206138856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 206138856 is about 14357.5365575018. The cubic root of 206138856 is about 590.7267268244.

The spelling of 206138856 in words is "two hundred six million, one hundred thirty-eight thousand, eight hundred fifty-six".