520213403 has 8 divisors (see below), whose sum is σ = 529679568. Its totient is φ = 510810624.

The previous prime is 520213381. The next prime is 520213409. The reversal of 520213403 is 304312025.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 520213403 - 2²⁶ = 453104539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520213409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875 + ... + 32267.

It is an arithmetic number, because the mean of its divisors is an integer number (66209946).

Almost surely, 2^520213403 is an apocalyptic number.

520213403 is a deficient number, since it is larger than the sum of its proper divisors (9466165).

520213403 is a wasteful number, since it uses less digits than its factorization.

520213403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31693.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 520213403 is about 22808.1871923220. The cubic root of 520213403 is about 804.2551411523.

Adding to 520213403 its reverse (304312025), we get a palindrome (824525428).

The spelling of 520213403 in words is "five hundred twenty million, two hundred thirteen thousand, four hundred three".