520402401 has 20 divisors (see below), whose sum is σ = 778527552. Its totient is φ = 346427928.

The previous prime is 520402397. The next prime is 520402409. The reversal of 520402401 is 104204025.

It is not a de Polignac number, because 520402401 - 2² = 520402397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520402409) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55860 + ... + 64506.

Almost surely, 2^520402401 is an apocalyptic number.

It is an amenable number.

520402401 is a deficient number, since it is larger than the sum of its proper divisors (258125151).

520402401 is an equidigital number, since it uses as much as digits as its factorization.

520402401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402 (or 9393 counting only the distinct ones).

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

The square root of 520402401 is about 22812.3300212845. The cubic root of 520402401 is about 804.3525269611.

Adding to 520402401 its reverse (104204025), we get a palindrome (624606426).

The spelling of 520402401 in words is "five hundred twenty million, four hundred two thousand, four hundred one".