205487 has 2 divisors, whose sum is σ = 205488. Its totient is φ = 205486.

The previous prime is 205483. The next prime is 205493. The reversal of 205487 is 784502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205487 - 2² = 205483 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102743 + 102744.

It is an arithmetic number, because the mean of its divisors is an integer number (102744).

2²⁰⁵⁴⁸⁷ is an apocalyptic number.

205487 is a deficient number, since it is larger than the sum of its proper divisors (1).

205487 is an equidigital number, since it uses as much as digits as its factorization.

205487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 205487 is about 453.3067394160. The cubic root of 205487 is about 59.0103400435.

Adding to 205487 its reverse (784502), we get a palindrome (989989).

The spelling of 205487 in words is "two hundred five thousand, four hundred eighty-seven".