206104138 has 8 divisors (see below), whose sum is σ = 309936132. Its totient is φ = 102792096.

The previous prime is 206104123. The next prime is 206104139. The reversal of 206104138 is 831401602.

It can be written as a sum of positive squares in 2 ways, for example, as 197205849 + 8898289 = 14043^2 + 2983^2 .

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

It is not an unprimeable number, because it can be changed into a prime (206104139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128995 + ... + 130582.

Almost surely, 2^206104138 is an apocalyptic number.

206104138 is a deficient number, since it is larger than the sum of its proper divisors (103831994).

206104138 is a wasteful number, since it uses less digits than its factorization.

206104138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259976.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 206104138 is about 14356.3274551676. The cubic root of 206104138 is about 590.6935614744.

The spelling of 206104138 in words is "two hundred six million, one hundred four thousand, one hundred thirty-eight".