31730 has 16 divisors (see below), whose sum is σ = 60480. Its totient is φ = 11952.

The previous prime is 31729. The next prime is 31741. The reversal of 31730 is 3713.

It is a happy number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107 + ... + 273.

It is an arithmetic number, because the mean of its divisors is an integer number (3780).

2³¹⁷³⁰ is an apocalyptic number.

31730 is a deficient number, since it is larger than the sum of its proper divisors (28750).

31730 is a wasteful number, since it uses less digits than its factorization.

31730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 63, while the sum is 14.

The square root of 31730 is about 178.1291666179. The cubic root of 31730 is about 31.6584774145.

The spelling of 31730 in words is "thirty-one thousand, seven hundred thirty".