205996849 has 4 divisors (see below), whose sum is σ = 209883636. Its totient is φ = 202110064.

The previous prime is 205996823. The next prime is 205996909. The reversal of 205996849 is 948699502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63361600 + 142635249 = 7960^2 + 11943^2 .

It is a cyclic number.

It is not a de Polignac number, because 205996849 - 2¹⁵ = 205964081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205996796 and 205996805.

It is not an unprimeable number, because it can be changed into a prime (205996949) 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, 1943314 + ... + 1943419.

It is an arithmetic number, because the mean of its divisors is an integer number (52470909).

Almost surely, 2^205996849 is an apocalyptic number.

It is an amenable number.

205996849 is a deficient number, since it is larger than the sum of its proper divisors (3886787).

205996849 is an equidigital number, since it uses as much as digits as its factorization.

205996849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886786.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 205996849 is about 14352.5903237012. The cubic root of 205996849 is about 590.5910470819.

The spelling of 205996849 in words is "two hundred five million, nine hundred ninety-six thousand, eight hundred forty-nine".