206439761 has 16 divisors (see below), whose sum is σ = 235241280. Its totient is φ = 179484480.

The previous prime is 206439749. The next prime is 206439767. The reversal of 206439761 is 167934602.

It is a cyclic number.

It is not a de Polignac number, because 206439761 - 2¹⁴ = 206423377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206439767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19715 + ... + 28311.

It is an arithmetic number, because the mean of its divisors is an integer number (14702580).

Almost surely, 2^206439761 is an apocalyptic number.

It is an amenable number.

206439761 is a deficient number, since it is larger than the sum of its proper divisors (28801519).

206439761 is a wasteful number, since it uses less digits than its factorization.

206439761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 206439761 is about 14368.0117274451. The cubic root of 206439761 is about 591.0140189432.

The spelling of 206439761 in words is "two hundred six million, four hundred thirty-nine thousand, seven hundred sixty-one".