318820 has 24 divisors (see below), whose sum is σ = 705600. Its totient is φ = 120672.

The previous prime is 318817. The next prime is 318823. The reversal of 318820 is 28813.

It is an interprime number because it is at equal distance from previous prime (318817) and next prime (318823).

It is a junction number, because it is equal to n+sod(n) for n = 318791 and 318800.

It is not an unprimeable number, because it can be changed into a prime (318823) 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, 40 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (29400).

2³¹⁸⁸²⁰ 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 318820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352800).

318820 is an abundant number, since it is smaller than the sum of its proper divisors (386780).

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

318820 is a wasteful number, since it uses less digits than its factorization.

318820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 318820 is about 564.6414791706. The cubic root of 318820 is about 68.3148604967.

The spelling of 318820 in words is "three hundred eighteen thousand, eight hundred twenty".