520440145 has 8 divisors (see below), whose sum is σ = 630055656. Its totient is φ = 412667136.

The previous prime is 520440143. The next prime is 520440169. The reversal of 520440145 is 541044025.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57501889 + 462938256 = 7583^2 + 21516^2 .

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 520440145 - 2¹ = 520440143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520440143) 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 in 7 ways as a sum of consecutive naturals, for example, 460002 + ... + 461131.

It is an arithmetic number, because the mean of its divisors is an integer number (78756957).

Almost surely, 2^520440145 is an apocalyptic number.

It is an amenable number.

520440145 is a deficient number, since it is larger than the sum of its proper divisors (109615511).

520440145 is a wasteful number, since it uses less digits than its factorization.

520440145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921251.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 520440145 is about 22813.1572782024. The cubic root of 520440145 is about 804.3719726489.

The spelling of 520440145 in words is "five hundred twenty million, four hundred forty thousand, one hundred forty-five".