505634 has 4 divisors (see below), whose sum is σ = 758454. Its totient is φ = 252816.

The previous prime is 505633. The next prime is 505639. The reversal of 505634 is 436505.

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., 418609 + 87025 = 647^2 + 295^2 .

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

It is not an unprimeable number, because it can be changed into a prime (505633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126407 + ... + 126410.

2⁵⁰⁵⁶³⁴ is an apocalyptic number.

505634 is a deficient number, since it is larger than the sum of its proper divisors (252820).

505634 is a wasteful number, since it uses less digits than its factorization.

505634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252819.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 505634 is about 711.0794611012. The cubic root of 505634 is about 79.6670537573.

The spelling of 505634 in words is "five hundred five thousand, six hundred thirty-four".