505658 has 4 divisors (see below), whose sum is σ = 758490. Its totient is φ = 252828.

The previous prime is 505657. The next prime is 505663. The reversal of 505658 is 856505.

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

It can be written as a sum of positive squares in only one way, i.e., 494209 + 11449 = 703^2 + 107^2 .

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 505658.

It is not an unprimeable number, because it can be changed into a prime (505657) 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 as a sum of consecutive naturals, namely, 126413 + ... + 126416.

2⁵⁰⁵⁶⁵⁸ is an apocalyptic number.

505658 is a deficient number, since it is larger than the sum of its proper divisors (252832).

505658 is a wasteful number, since it uses less digits than its factorization.

505658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252831.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 505658 is about 711.0963366521. The cubic root of 505658 is about 79.6683142072.

The spelling of 505658 in words is "five hundred five thousand, six hundred fifty-eight".