520171998 has 16 divisors (see below), whose sum is σ = 1059973776. Its totient is φ = 170119040.

The previous prime is 520171997. The next prime is 520172017. The reversal of 520171998 is 899171025.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520171997) 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, 817563 + ... + 818198.

It is an arithmetic number, because the mean of its divisors is an integer number (66248361).

Almost surely, 2^520171998 is an apocalyptic number.

520171998 is an abundant number, since it is smaller than the sum of its proper divisors (539801778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520171998 is a wasteful number, since it uses less digits than its factorization.

520171998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635819.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 520171998 is about 22807.2794958101. The cubic root of 520171998 is about 804.2338030711.

The spelling of 520171998 in words is "five hundred twenty million, one hundred seventy-one thousand, nine hundred ninety-eight".