520231404 has 48 divisors (see below), whose sum is σ = 1513403136. Its totient is φ = 135124800.

The previous prime is 520231277. The next prime is 520231409. The reversal of 520231404 is 404132025.

It is a super-2 number, since 2×520231404² = 541281427415622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (520231409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280587 + ... + 282434.

It is an arithmetic number, because the mean of its divisors is an integer number (31529232).

Almost surely, 2^520231404 is an apocalyptic number.

It is an amenable number.

520231404 is an abundant number, since it is smaller than the sum of its proper divisors (993171732).

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

520231404 is a wasteful number, since it uses less digits than its factorization.

520231404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563046 (or 563044 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 520231404 is about 22808.5818059782. The cubic root of 520231404 is about 804.2644176209.

Adding to 520231404 its reverse (404132025), we get a palindrome (924363429).

The spelling of 520231404 in words is "five hundred twenty million, two hundred thirty-one thousand, four hundred four".