520223444 has 12 divisors (see below), whose sum is σ = 980421204. Its totient is φ = 240103104.

The previous prime is 520223437. The next prime is 520223447. The reversal of 520223444 is 444322025.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 96275344 + 423948100 = 9812^2 + 20590^2 .

It is a super-2 number, since 2×520223444² = 541264863374442272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520223447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5002097 + ... + 5002200.

It is an arithmetic number, because the mean of its divisors is an integer number (81701767).

Almost surely, 2^520223444 is an apocalyptic number.

It is an amenable number.

520223444 is a deficient number, since it is larger than the sum of its proper divisors (460197760).

520223444 is a wasteful number, since it uses less digits than its factorization.

520223444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004314 (or 10004312 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 520223444 is about 22808.4073095865. The cubic root of 520223444 is about 804.2603156146.

Adding to 520223444 its reverse (444322025), we get a palindrome (964545469).

The spelling of 520223444 in words is "five hundred twenty million, two hundred twenty-three thousand, four hundred forty-four".