313840 has 20 divisors (see below), whose sum is σ = 729864. Its totient is φ = 125504.

The previous prime is 313829. The next prime is 313849. The reversal of 313840 is 48313.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1882 + ... + 2041.

2³¹³⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

313840 is an abundant number, since it is smaller than the sum of its proper divisors (416024).

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

313840 is a wasteful number, since it uses less digits than its factorization.

313840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936 (or 3930 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 313840 is about 560.2142447314. The cubic root of 313840 is about 67.9572972952.

The spelling of 313840 in words is "three hundred thirteen thousand, eight hundred forty".