30806 has 8 divisors (see below), whose sum is σ = 47064.
Its totient is φ = 15120.
The previous prime is 30803. The next prime is 30809. The reversal of 30806 is 60803.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (30803) and next prime (30809).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (30803) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41 + ... + 251.
It is an arithmetic number, because the mean of its divisors is an integer number (5883).
230806 is an apocalyptic number.
30806 is a deficient number, since it is larger than the sum of its proper divisors (16258).
30806 is a wasteful number, since it uses less digits than its factorization.
30806 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 286.
The product of its (nonzero) digits is 144, while the sum is 17.
The square root of 30806 is about 175.5163810019.
The cubic root of 30806 is about 31.3481394740.
The spelling of 30806 in words is "thirty thousand, eight hundred six".