205732138 has 8 divisors (see below), whose sum is σ = 313657380. Its totient is φ = 101179680.

The previous prime is 205732129. The next prime is 205732157. The reversal of 205732138 is 831237502.

It can be written as a sum of positive squares in 2 ways, for example, as 133702969 + 72029169 = 11563^2 + 8487^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843043 + ... + 843286.

Almost surely, 2^205732138 is an apocalyptic number.

205732138 is a deficient number, since it is larger than the sum of its proper divisors (107925242).

205732138 is a wasteful number, since it uses less digits than its factorization.

205732138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686392.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 205732138 is about 14343.3656440879. The cubic root of 205732138 is about 590.3379639879.

The spelling of 205732138 in words is "two hundred five million, seven hundred thirty-two thousand, one hundred thirty-eight".