505638 has 24 divisors (see below), whose sum is σ = 1252368. Its totient is φ = 144432.

The previous prime is 505633. The next prime is 505639. The reversal of 505638 is 836505.

505638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1881 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (52182).

2⁵⁰⁵⁶³⁸ is an apocalyptic number.

505638 is an abundant number, since it is smaller than the sum of its proper divisors (746730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505638 is a wasteful number, since it uses less digits than its factorization.

505638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4025 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 505638 is about 711.0822737208. The cubic root of 505638 is about 79.6672638351.

The spelling of 505638 in words is "five hundred five thousand, six hundred thirty-eight".