205855869 has 8 divisors (see below), whose sum is σ = 279653472. Its totient is φ = 134647760.

The previous prime is 205855831. The next prime is 205855913. The reversal of 205855869 is 968558502.

205855869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205855869 - 2⁹ = 205855357 is a prime.

It is a super-2 number, since 2×205855869² = 84753277603490322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205859869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647187 + ... + 647504.

It is an arithmetic number, because the mean of its divisors is an integer number (34956684).

Almost surely, 2^205855869 is an apocalyptic number.

It is an amenable number.

205855869 is a deficient number, since it is larger than the sum of its proper divisors (73797603).

205855869 is a wasteful number, since it uses less digits than its factorization.

205855869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294747.

The product of its (nonzero) digits is 864000, while the sum is 48.

The square root of 205855869 is about 14347.6781745340. The cubic root of 205855869 is about 590.4562868860.

The spelling of 205855869 in words is "two hundred five million, eight hundred fifty-five thousand, eight hundred sixty-nine".