521424540 has 384 divisors, whose sum is σ = 2036643840. Its totient is φ = 109175040.

The previous prime is 521424539. The next prime is 521424577. The reversal of 521424540 is 45424125.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3980275 + ... + 3980405.

It is an arithmetic number, because the mean of its divisors is an integer number (5303760).

Almost surely, 2^521424540 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 521424540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018321920).

521424540 is an abundant number, since it is smaller than the sum of its proper divisors (1515219300).

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

521424540 is a wasteful number, since it uses less digits than its factorization.

521424540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 521424540 is about 22834.7222448621. The cubic root of 521424540 is about 804.8788007290.

Adding to 521424540 its reverse (45424125), we get a palindrome (566848665).

The spelling of 521424540 in words is "five hundred twenty-one million, four hundred twenty-four thousand, five hundred forty".