521000424 has 80 divisors (see below), whose sum is σ = 1667767200. Its totient is φ = 148855968.

The previous prime is 521000401. The next prime is 521000461. The reversal of 521000424 is 424000125.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 521000397 and 521000406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52894 + ... + 61965.

It is an arithmetic number, because the mean of its divisors is an integer number (20847090).

Almost surely, 2^521000424 is an apocalyptic number.

521000424 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

521000424 is an abundant number, since it is smaller than the sum of its proper divisors (1146766776).

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

521000424 is a wasteful number, since it uses less digits than its factorization.

521000424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114884 (or 114871 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 521000424 is about 22825.4337089134. The cubic root of 521000424 is about 804.6605175801.

Adding to 521000424 its reverse (424000125), we get a palindrome (945000549).

The spelling of 521000424 in words is "five hundred twenty-one million, four hundred twenty-four", and thus it is an aban number.