521838 has 24 divisors (see below), whose sum is σ = 1154088. Its totient is φ = 170352.

The previous prime is 521831. The next prime is 521861. The reversal of 521838 is 838125.

It is a happy number.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521838.

It is not an unprimeable number, because it can be changed into a prime (521831) 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, 681 + ... + 1227.

It is an arithmetic number, because the mean of its divisors is an integer number (48087).

2⁵²¹⁸³⁸ is an apocalyptic number.

521838 is an abundant number, since it is smaller than the sum of its proper divisors (632250).

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

521838 is a wasteful number, since it uses less digits than its factorization.

521838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 605 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 521838 is about 722.3835546301. The cubic root of 521838 is about 80.5091485558.

The spelling of 521838 in words is "five hundred twenty-one thousand, eight hundred thirty-eight".