520979440 has 80 divisors (see below), whose sum is σ = 1285632000. Its totient is φ = 195911936.

The previous prime is 520979419. The next prime is 520979441. The reversal of 520979440 is 44979025.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 520979393 and 520979402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520979441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106161 + ... + 110959.

It is an arithmetic number, because the mean of its divisors is an integer number (16070400).

Almost surely, 2^520979440 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 520979440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642816000).

520979440 is an abundant number, since it is smaller than the sum of its proper divisors (764652560).

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

520979440 is a wasteful number, since it uses less digits than its factorization.

520979440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4894 (or 4888 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 520979440 is about 22824.9740416063. The cubic root of 520979440 is about 804.6497145031.

The spelling of 520979440 in words is "five hundred twenty million, nine hundred seventy-nine thousand, four hundred forty".