331840 has 56 divisors (see below), whose sum is σ = 850392. Its totient is φ = 122880.

The previous prime is 331819. The next prime is 331841. The reversal of 331840 is 48133.

It can be written as a sum of positive squares in 4 ways, for example, as 9216 + 322624 = 96^2 + 568^2 .

It is a super-2 number, since 2×331840² = 220235571200, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331841) by changing a digit.

331840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5410 + ... + 5470.

2³³¹⁸⁴⁰ 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 331840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425196).

331840 is an abundant number, since it is smaller than the sum of its proper divisors (518552).

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

331840 is a wasteful number, since it uses less digits than its factorization.

331840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 85 counting only the distinct ones).

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

The square root of 331840 is about 576.0555528766. The cubic root of 331840 is about 69.2324304761.

Adding to 331840 its reverse (48133), we get a palindrome (379973).

The spelling of 331840 in words is "three hundred thirty-one thousand, eight hundred forty".