206711985 has 8 divisors (see below), whose sum is σ = 330739200. Its totient is φ = 110246384.

The previous prime is 206711957. The next prime is 206712053. The reversal of 206711985 is 589117602.

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 206711985 - 2⁹ = 206711473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6890385 + ... + 6890414.

It is an arithmetic number, because the mean of its divisors is an integer number (41342400).

Almost surely, 2^206711985 is an apocalyptic number.

It is an amenable number.

206711985 is a deficient number, since it is larger than the sum of its proper divisors (124027215).

206711985 is a wasteful number, since it uses less digits than its factorization.

206711985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13780807.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 206711985 is about 14377.4818727064. The cubic root of 206711985 is about 591.2736871588.

The spelling of 206711985 in words is "two hundred six million, seven hundred eleven thousand, nine hundred eighty-five".