317840 has 40 divisors (see below), whose sum is σ = 770040. Its totient is φ = 121856.

The previous prime is 317839. The next prime is 317857. The reversal of 317840 is 48713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43264 + 274576 = 208^2 + 524^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2252 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (19251).

2³¹⁷⁸⁴⁰ 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 317840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385020).

317840 is an abundant number, since it is smaller than the sum of its proper divisors (452200).

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

317840 is a wasteful number, since it uses less digits than its factorization.

317840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 317840 is about 563.7730039652. The cubic root of 317840 is about 68.2447924574.

The spelling of 317840 in words is "three hundred seventeen thousand, eight hundred forty".