521448 has 16 divisors (see below), whose sum is σ = 1303680. Its totient is φ = 173808.

The previous prime is 521447. The next prime is 521471. The reversal of 521448 is 844125.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 21727 = 521448 / (5 + 2 + 1 + 4 + 4 + 8).

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 3 ways as a sum of consecutive naturals, for example, 10840 + ... + 10887.

It is an arithmetic number, because the mean of its divisors is an integer number (81480).

2⁵²¹⁴⁴⁸ is an apocalyptic number.

It is an amenable number.

521448 is an abundant number, since it is smaller than the sum of its proper divisors (782232).

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

521448 is a wasteful number, since it uses less digits than its factorization.

521448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21736 (or 21732 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 521448 is about 722.1135644758. The cubic root of 521448 is about 80.4890871618.

It can be divided in two parts, 521 and 448, that added together give a palindrome (969).

The spelling of 521448 in words is "five hundred twenty-one thousand, four hundred forty-eight".