206863861 has 8 divisors (see below), whose sum is σ = 209181440. Its totient is φ = 204552432.

The previous prime is 206863829. The next prime is 206863957. The reversal of 206863861 is 168368602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206863861 - 2⁵ = 206863829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206863801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106051 + ... + 107983.

It is an arithmetic number, because the mean of its divisors is an integer number (26147680).

Almost surely, 2^206863861 is an apocalyptic number.

It is an amenable number.

206863861 is a deficient number, since it is larger than the sum of its proper divisors (2317579).

206863861 is a wasteful number, since it uses less digits than its factorization.

206863861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 206863861 is about 14382.7626344872. The cubic root of 206863861 is about 591.4184591205.

The spelling of 206863861 in words is "two hundred six million, eight hundred sixty-three thousand, eight hundred sixty-one".