206857854 has 128 divisors (see below), whose sum is σ = 550502400. Its totient is φ = 56337120.

The previous prime is 206857831. The next prime is 206857891. The reversal of 206857854 is 458758602.

206857854 is a `hidden beast` number, since 20 + 6 + 8 + 578 + 54 = 666.

It is a super-2 number, since 2×206857854² = 85580343522970632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1488117 + ... + 1488255.

It is an arithmetic number, because the mean of its divisors is an integer number (4300800).

Almost surely, 2^206857854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206857854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275251200).

206857854 is an abundant number, since it is smaller than the sum of its proper divisors (343644546).

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

206857854 is a wasteful number, since it uses less digits than its factorization.

206857854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 206857854 is about 14382.5538066089. The cubic root of 206857854 is about 591.4127344456.

The spelling of 206857854 in words is "two hundred six million, eight hundred fifty-seven thousand, eight hundred fifty-four".