520400402 has 4 divisors (see below), whose sum is σ = 780600606. Its totient is φ = 260200200.

The previous prime is 520400401. The next prime is 520400417. The reversal of 520400402 is 204004025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 461433361 + 58967041 = 21481^2 + 7679^2 .

It is not an unprimeable number, because it can be changed into a prime (520400401) 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 as a sum of consecutive naturals, namely, 130100099 + ... + 130100102.

Almost surely, 2^520400402 is an apocalyptic number.

520400402 is a deficient number, since it is larger than the sum of its proper divisors (260200204).

520400402 is a wasteful number, since it uses less digits than its factorization.

520400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260200203.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 520400402 is about 22812.2862072174. The cubic root of 520400402 is about 804.3514970512.

Adding to 520400402 its reverse (204004025), we get a palindrome (724404427).

The spelling of 520400402 in words is "five hundred twenty million, four hundred thousand, four hundred two".