518143956 has 48 divisors (see below), whose sum is σ = 1323231168. Its totient is φ = 156499200.

The previous prime is 518143949. The next prime is 518143963. The reversal of 518143956 is 659341815.

It is an interprime number because it is at equal distance from previous prime (518143949) and next prime (518143963).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35046 + ... + 47586.

It is an arithmetic number, because the mean of its divisors is an integer number (27567316).

Almost surely, 2^518143956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 518143956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661615584).

518143956 is an abundant number, since it is smaller than the sum of its proper divisors (805087212).

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

518143956 is a wasteful number, since it uses less digits than its factorization.

518143956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12872 (or 12870 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 518143956 is about 22762.7756655466. The cubic root of 518143956 is about 803.1872619215.

The spelling of 518143956 in words is "five hundred eighteen million, one hundred forty-three thousand, nine hundred fifty-six".