206406985 has 8 divisors (see below), whose sum is σ = 247840200. Its totient is φ = 165024384.

The previous prime is 206406983. The next prime is 206407001. The reversal of 206406985 is 589604602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26337424 + 180069561 = 5132^2 + 13419^2 .

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 206406985 - 2¹ = 206406983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206406983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3010 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (30980025).

Almost surely, 2^206406985 is an apocalyptic number.

It is an amenable number.

206406985 is a deficient number, since it is larger than the sum of its proper divisors (41433215).

206406985 is a wasteful number, since it uses less digits than its factorization.

206406985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25307.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 206406985 is about 14366.8710928998. The cubic root of 206406985 is about 590.9827392766.

The spelling of 206406985 in words is "two hundred six million, four hundred six thousand, nine hundred eighty-five".