521442 has 24 divisors (see below), whose sum is σ = 1151280. Its totient is φ = 170520.

The previous prime is 521429. The next prime is 521447. The reversal of 521442 is 244125.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (521447) by changing a digit.

521442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 817 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (47970).

2⁵²¹⁴⁴² is an apocalyptic number.

521442 is an abundant number, since it is smaller than the sum of its proper divisors (629838).

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

521442 is a wasteful number, since it uses less digits than its factorization.

521442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 555 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 521442 is about 722.1094099927. The cubic root of 521442 is about 80.4887784469.

Adding to 521442 its reverse (244125), we get a palindrome (765567).

The spelling of 521442 in words is "five hundred twenty-one thousand, four hundred forty-two".