520632421 has 8 divisors (see below), whose sum is σ = 528847488. Its totient is φ = 512442000.

The previous prime is 520632407. The next prime is 520632443. The reversal of 520632421 is 124236025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520632421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520632401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38991 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (66105936).

Almost surely, 2^520632421 is an apocalyptic number.

It is an amenable number.

520632421 is a deficient number, since it is larger than the sum of its proper divisors (8215067).

520632421 is a wasteful number, since it uses less digits than its factorization.

520632421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12323.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 520632421 is about 22817.3710361207. The cubic root of 520632421 is about 804.4710185458.

Adding to 520632421 its reverse (124236025), we get a palindrome (644868446).

The spelling of 520632421 in words is "five hundred twenty million, six hundred thirty-two thousand, four hundred twenty-one".