30665 has 4 divisors (see below), whose sum is σ = 36804. Its totient is φ = 24528.

The previous prime is 30661. The next prime is 30671. The reversal of 30665 is 56603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22201 + 8464 = 149^2 + 92^2 .

It is a cyclic number.

It is not a de Polignac number, because 30665 - 2² = 30661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30665.

It is not an unprimeable number, because it can be changed into a prime (30661) 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, 3062 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (9201).

2³⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

30665 is a deficient number, since it is larger than the sum of its proper divisors (6139).

30665 is an equidigital number, since it uses as much as digits as its factorization.

30665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6138.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 30665 is about 175.1142484209. The cubic root of 30665 is about 31.3002391895.

The spelling of 30665 in words is "thirty thousand, six hundred sixty-five".