30686 has 8 divisors (see below), whose sum is σ = 46920. Its totient is φ = 15048.

The previous prime is 30677. The next prime is 30689. The reversal of 30686 is 68603.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30689) by changing a digit.

30686 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 3 ways as a sum of consecutive naturals, for example, 20 + ... + 248.

It is an arithmetic number, because the mean of its divisors is an integer number (5865).

2³⁰⁶⁸⁶ is an apocalyptic number.

30686 is a deficient number, since it is larger than the sum of its proper divisors (16234).

30686 is a wasteful number, since it uses less digits than its factorization.

30686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 30686 is about 175.1741990134. The cubic root of 30686 is about 31.3073825672.

The spelling of 30686 in words is "thirty thousand, six hundred eighty-six".