505645 has 8 divisors (see below), whose sum is σ = 693504. Its totient is φ = 346704.

The previous prime is 505643. The next prime is 505657. The reversal of 505645 is 546505.

505645 is nontrivially palindromic in base 6.

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 505645 - 2¹ = 505643 is a prime.

It is a super-3 number, since 3×505645³ = 387845186763633375, which contains 333 as substring.

505645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505643) 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 in 7 ways as a sum of consecutive naturals, for example, 7189 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (86688).

2⁵⁰⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

505645 is a deficient number, since it is larger than the sum of its proper divisors (187859).

505645 is a wasteful number, since it uses less digits than its factorization.

505645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14459.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 505645 is about 711.0871957784. The cubic root of 505645 is about 79.6676314685.

The spelling of 505645 in words is "five hundred five thousand, six hundred forty-five".