521444 has 24 divisors (see below), whose sum is σ = 1138368. Its totient is φ = 203040.

The previous prime is 521429. The next prime is 521447. The reversal of 521444 is 444125.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521444.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (47432).

2⁵²¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

521444 is an abundant number, since it is smaller than the sum of its proper divisors (616924).

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

521444 is a wasteful number, since it uses less digits than its factorization.

521444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715 (or 1713 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 521444 is about 722.1107948231. The cubic root of 521444 is about 80.4888813521.

Adding to 521444 its reverse (444125), we get a palindrome (965569).

The spelling of 521444 in words is "five hundred twenty-one thousand, four hundred forty-four".