521412320 has 144 divisors (see below), whose sum is σ = 1455974352. Its totient is φ = 174919680.

The previous prime is 521412319. The next prime is 521412347. The reversal of 521412320 is 23214125.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 521412292 and 521412301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296564 + ... + 298316.

It is an arithmetic number, because the mean of its divisors is an integer number (10110933).

Almost surely, 2^521412320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521412320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727987176).

521412320 is an abundant number, since it is smaller than the sum of its proper divisors (934562032).

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

521412320 is a wasteful number, since it uses less digits than its factorization.

521412320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1784 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 521412320 is about 22834.4546683296. The cubic root of 521412320 is about 804.8725130210.

Adding to 521412320 its reverse (23214125), we get a palindrome (544626445).

The spelling of 521412320 in words is "five hundred twenty-one million, four hundred twelve thousand, three hundred twenty".