319640 has 32 divisors (see below), whose sum is σ = 736560. Its totient is φ = 124800.

The previous prime is 319639. The next prime is 319673. The reversal of 319640 is 46913.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2375 + ... + 2505.

2³¹⁹⁶⁴⁰ 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 319640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368280).

319640 is an abundant number, since it is smaller than the sum of its proper divisors (416920).

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

319640 is a wasteful number, since it uses less digits than its factorization.

319640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 319640 is about 565.3671373541. The cubic root of 319640 is about 68.3733786032.

It can be divided in two parts, 319 and 640, that added together give a palindrome (959).

The spelling of 319640 in words is "three hundred nineteen thousand, six hundred forty".