206687139 has 16 divisors (see below), whose sum is σ = 293736960. Its totient is φ = 128822400.

The previous prime is 206687123. The next prime is 206687167. The reversal of 206687139 is 931786602.

It is a happy number.

206687139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206687139 - 2⁴ = 206687123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206687139.

It is not an unprimeable number, because it can be changed into a prime (206687119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5719 + ... + 21120.

It is an arithmetic number, because the mean of its divisors is an integer number (18358560).

Almost surely, 2^206687139 is an apocalyptic number.

206687139 is a deficient number, since it is larger than the sum of its proper divisors (87049821).

206687139 is a wasteful number, since it uses less digits than its factorization.

206687139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27010.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 206687139 is about 14376.6177872266. The cubic root of 206687139 is about 591.2499965881.

The spelling of 206687139 in words is "two hundred six million, six hundred eighty-seven thousand, one hundred thirty-nine".