520321402 has 4 divisors (see below), whose sum is σ = 780482106. Its totient is φ = 260160700.

The previous prime is 520321379. The next prime is 520321409. The reversal of 520321402 is 204123025.

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., 439698961 + 80622441 = 20969^2 + 8979^2 .

It is a super-2 number, since 2×520321402² = 541468722758491208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 520321402.

It is not an unprimeable number, because it can be changed into a prime (520321409) by changing a digit.

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 as a sum of consecutive naturals, namely, 130080349 + ... + 130080352.

Almost surely, 2^520321402 is an apocalyptic number.

520321402 is a deficient number, since it is larger than the sum of its proper divisors (260160704).

520321402 is a wasteful number, since it uses less digits than its factorization.

520321402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260160703.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 520321402 is about 22810.5546184217. The cubic root of 520321402 is about 804.3107931472.

Adding to 520321402 its reverse (204123025), we get a palindrome (724444427).

The spelling of 520321402 in words is "five hundred twenty million, three hundred twenty-one thousand, four hundred two".