505445 has 4 divisors (see below), whose sum is σ = 606540. Its totient is φ = 404352.

The previous prime is 505429. The next prime is 505447. The reversal of 505445 is 544505.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113569 + 391876 = 337^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 505445 - 2⁴ = 505429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50540 + ... + 50549.

It is an arithmetic number, because the mean of its divisors is an integer number (151635).

2⁵⁰⁵⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

505445 is a deficient number, since it is larger than the sum of its proper divisors (101095).

505445 is a wasteful number, since it uses less digits than its factorization.

505445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101094.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 505445 is about 710.9465521402. The cubic root of 505445 is about 79.6571263199.

Subtracting 505445 from its reverse (544505), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 505445 in words is "five hundred five thousand, four hundred forty-five".