318471840 has 144 divisors (see below), whose sum is σ = 1097296200. Its totient is φ = 84105216.

The previous prime is 318471833. The next prime is 318471841. The reversal of 318471840 is 48174813.

It can be written as a sum of positive squares in 4 ways, for example, as 318408336 + 63504 = 17844^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 318471795 and 318471804.

It is not an unprimeable number, because it can be changed into a prime (318471841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155946 + ... + 157974.

Almost surely, 2^318471840 is an apocalyptic number.

318471840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 318471840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (548648100).

318471840 is an abundant number, since it is smaller than the sum of its proper divisors (778824360).

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

318471840 is a wasteful number, since it uses less digits than its factorization.

318471840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2148 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 318471840 is about 17845.7793329403. The cubic root of 318471840 is about 682.8998421873.

The spelling of 318471840 in words is "three hundred eighteen million, four hundred seventy-one thousand, eight hundred forty".