205979895 has 64 divisors (see below), whose sum is σ = 413337600. Its totient is φ = 96405120.

The previous prime is 205979867. The next prime is 205979923. The reversal of 205979895 is 598979502.

It is an interprime number because it is at equal distance from previous prime (205979867) and next prime (205979923).

It is not a de Polignac number, because 205979895 - 2⁵ = 205979863 is a prime.

It is a super-2 number, since 2×205979895² = 84855434288422050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 40674 + ... + 45456.

It is an arithmetic number, because the mean of its divisors is an integer number (6458400).

Almost surely, 2^205979895 is an apocalyptic number.

205979895 is an abundant number, since it is smaller than the sum of its proper divisors (207357705).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205979895 is a wasteful number, since it uses less digits than its factorization.

205979895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837 (or 4831 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The square root of 205979895 is about 14351.9996864548. Note that the first 3 decimals coincide. The cubic root of 205979895 is about 590.5748443174.

It can be divided in two parts, 205 and 979895, that added together give a square (980100 = 990²).

The spelling of 205979895 in words is "two hundred five million, nine hundred seventy-nine thousand, eight hundred ninety-five".