518831478 has 48 divisors (see below), whose sum is σ = 1232773776. Its totient is φ = 156395520.

The previous prime is 518831441. The next prime is 518831479. The reversal of 518831478 is 874138815.

It is a happy number.

It is a super-2 number, since 2×518831478² = 538372205127328968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518831479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31426 + ... + 45002.

It is an arithmetic number, because the mean of its divisors is an integer number (25682787).

Almost surely, 2^518831478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 518831478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (616386888).

518831478 is an abundant number, since it is smaller than the sum of its proper divisors (713942298).

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

518831478 is a wasteful number, since it uses less digits than its factorization.

518831478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13789 (or 13786 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 518831478 is about 22777.8725521064. The cubic root of 518831478 is about 803.5423529763.

It can be divided in two parts, 51883 and 1478, that added together give a square (53361 = 231²).

The spelling of 518831478 in words is "five hundred eighteen million, eight hundred thirty-one thousand, four hundred seventy-eight".