205694138 has 8 divisors (see below), whose sum is σ = 332275188. Its totient is φ = 94935744.

The previous prime is 205694107. The next prime is 205694143. The reversal of 205694138 is 831496502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 199459129 + 6235009 = 14123^2 + 2497^2 .

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

It is a Curzon number.

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, 3955631 + ... + 3955682.

Almost surely, 2^205694138 is an apocalyptic number.

205694138 is a deficient number, since it is larger than the sum of its proper divisors (126581050).

205694138 is a wasteful number, since it uses less digits than its factorization.

205694138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911328.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 205694138 is about 14342.0409286824. The cubic root of 205694138 is about 590.3016153906.

The spelling of 205694138 in words is "two hundred five million, six hundred ninety-four thousand, one hundred thirty-eight".