205840851 has 8 divisors (see below), whose sum is σ = 288899520. Its totient is φ = 130004712.

The previous prime is 205840847. The next prime is 205840853. The reversal of 205840851 is 158048502.

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

It is not a de Polignac number, because 205840851 - 2² = 205840847 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (205840853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1805565 + ... + 1805678.

It is an arithmetic number, because the mean of its divisors is an integer number (36112440).

Almost surely, 2^205840851 is an apocalyptic number.

205840851 is a deficient number, since it is larger than the sum of its proper divisors (83058669).

205840851 is a wasteful number, since it uses less digits than its factorization.

205840851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611265.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 205840851 is about 14347.1548050476. The cubic root of 205840851 is about 590.4419278295.

The spelling of 205840851 in words is "two hundred five million, eight hundred forty thousand, eight hundred fifty-one".