331730 has 24 divisors (see below), whose sum is σ = 695628. Its totient is φ = 113568.

The previous prime is 331711. The next prime is 331739. The reversal of 331730 is 37133.

331730 = T₉₁ + T₉₂ + ... + T₁₃₉.

It can be written as a sum of positive squares in 2 ways, for example, as 305809 + 25921 = 553^2 + 161^2 .

It is a super-2 number, since 2×331730² = 220089585800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331699 and 331708.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331730.

It is not an unprimeable number, because it can be changed into a prime (331739) by changing a digit.

331730 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 11 ways as a sum of consecutive naturals, for example, 152 + ... + 828.

2³³¹⁷³⁰ is an apocalyptic number.

331730 is an abundant number, since it is smaller than the sum of its proper divisors (363898).

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

331730 is a wasteful number, since it uses less digits than its factorization.

331730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 189, while the sum is 17.

The square root of 331730 is about 575.9600680603. The cubic root of 331730 is about 69.2247797921.

Adding to 331730 its reverse (37133), we get a palindrome (368863).

The spelling of 331730 in words is "three hundred thirty-one thousand, seven hundred thirty".