520406400 has 192 divisors, whose sum is σ = 1730246400. Its totient is φ = 137472000.

The previous prime is 520406347. The next prime is 520406423. The reversal of 520406400 is 4604025.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable 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, 1449421 + ... + 1449779.

It is an arithmetic number, because the mean of its divisors is an integer number (9011700).

Almost surely, 2^520406400 is an apocalyptic number.

520406400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520406400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865123200).

520406400 is an abundant number, since it is smaller than the sum of its proper divisors (1209840000).

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

520406400 is a wasteful number, since it uses less digits than its factorization.

520406400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 520406400 is about 22812.4176710843. The cubic root of 520406400 is about 804.3545872882.

The spelling of 520406400 in words is "five hundred twenty million, four hundred six thousand, four hundred".