505745 has 4 divisors (see below), whose sum is σ = 606900. Its totient is φ = 404592.

The previous prime is 505727. The next prime is 505759. The reversal of 505745 is 547505.

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 398161 + 107584 = 631^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 505745 - 2¹⁴ = 489361 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50570 + ... + 50579.

It is an arithmetic number, because the mean of its divisors is an integer number (151725).

2⁵⁰⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

505745 is a deficient number, since it is larger than the sum of its proper divisors (101155).

505745 is a wasteful number, since it uses less digits than its factorization.

505745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101154.

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 505745 is about 711.1575071670. The cubic root of 505745 is about 79.6728830040.

The spelling of 505745 in words is "five hundred five thousand, seven hundred forty-five".