520634 has 4 divisors (see below), whose sum is σ = 780954. Its totient is φ = 260316.

The previous prime is 520633. The next prime is 520649. The reversal of 520634 is 436025.

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., 511225 + 9409 = 715^2 + 97^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520631) 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, 130157 + ... + 130160.

2⁵²⁰⁶³⁴ is an apocalyptic number.

520634 is a deficient number, since it is larger than the sum of its proper divisors (260320).

520634 is a wasteful number, since it uses less digits than its factorization.

520634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260319.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 520634 is about 721.5497210865. The cubic root of 520634 is about 80.4471831825.

Adding to 520634 its reverse (436025), we get a palindrome (956659).

The spelling of 520634 in words is "five hundred twenty thousand, six hundred thirty-four".