206349639 has 8 divisors (see below), whose sum is σ = 277568112. Its totient is φ = 136348800.

The previous prime is 206349623. The next prime is 206349673. The reversal of 206349639 is 936943602.

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

It is not a de Polignac number, because 206349639 - 2⁴ = 206349623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206349639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206349739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304012 + ... + 304689.

It is an arithmetic number, because the mean of its divisors is an integer number (34696014).

Almost surely, 2^206349639 is an apocalyptic number.

206349639 is a deficient number, since it is larger than the sum of its proper divisors (71218473).

206349639 is a wasteful number, since it uses less digits than its factorization.

206349639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608817.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 206349639 is about 14364.8751821935. The cubic root of 206349639 is about 590.9280033459.

The spelling of 206349639 in words is "two hundred six million, three hundred forty-nine thousand, six hundred thirty-nine".