520421740 has 12 divisors (see below), whose sum is σ = 1092885696. Its totient is φ = 208168688.

The previous prime is 520421717. The next prime is 520421749. The reversal of 520421740 is 47124025.

It is not an unprimeable number, because it can be changed into a prime (520421749) 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, 13010524 + ... + 13010563.

It is an arithmetic number, because the mean of its divisors is an integer number (91073808).

Almost surely, 2^520421740 is an apocalyptic number.

It is an amenable number.

520421740 is an abundant number, since it is smaller than the sum of its proper divisors (572463956).

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

520421740 is a wasteful number, since it uses less digits than its factorization.

520421740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26021096 (or 26021094 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 520421740 is about 22812.7538889981. The cubic root of 520421740 is about 804.3624905206.

Adding to 520421740 its reverse (47124025), we get a palindrome (567545765).

The spelling of 520421740 in words is "five hundred twenty million, four hundred twenty-one thousand, seven hundred forty".