521478 has 48 divisors (see below), whose sum is σ = 1244880. Its totient is φ = 163296.

The previous prime is 521471. The next prime is 521483. The reversal of 521478 is 874125.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a nialpdrome in base 3 and base 9.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521471) by changing a digit.

521478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14076 + ... + 14112.

It is an arithmetic number, because the mean of its divisors is an integer number (25935).

2⁵²¹⁴⁷⁸ is an apocalyptic number.

521478 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 521478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622440).

521478 is an abundant number, since it is smaller than the sum of its proper divisors (723402).

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

521478 is a wasteful number, since it uses less digits than its factorization.

521478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 71 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 521478 is about 722.1343365330. The cubic root of 521478 is about 80.4906307010.

It can be divided in two parts, 521 and 478, that added together give a palindrome (999).

The spelling of 521478 in words is "five hundred twenty-one thousand, four hundred seventy-eight".