205249385 has 16 divisors (see below), whose sum is σ = 277957440. Its totient is φ = 144123840.

The previous prime is 205249351. The next prime is 205249391. The reversal of 205249385 is 583942502.

It is not a de Polignac number, because 205249385 - 2⁸ = 205249129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62747 + ... + 65936.

It is an arithmetic number, because the mean of its divisors is an integer number (17372340).

Almost surely, 2^205249385 is an apocalyptic number.

It is an amenable number.

205249385 is a deficient number, since it is larger than the sum of its proper divisors (72708055).

205249385 is a wasteful number, since it uses less digits than its factorization.

205249385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128728.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 205249385 is about 14326.5273182303. The cubic root of 205249385 is about 589.8758572476.

The spelling of 205249385 in words is "two hundred five million, two hundred forty-nine thousand, three hundred eighty-five".