30505223 has 4 divisors (see below), whose sum is σ = 34863120. Its totient is φ = 26147328.

The previous prime is 30505213. The next prime is 30505231. The reversal of 30505223 is 32250503.

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

It is a cyclic number.

It is not a de Polignac number, because 30505223 - 2⁶ = 30505159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30505195 and 30505204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30505213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178938 + ... + 2178951.

It is an arithmetic number, because the mean of its divisors is an integer number (8715780).

Almost surely, 2^30505223 is an apocalyptic number.

30505223 is a deficient number, since it is larger than the sum of its proper divisors (4357897).

30505223 is an equidigital number, since it uses as much as digits as its factorization.

30505223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357896.

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 30505223 is about 5523.1533565528. The cubic root of 30505223 is about 312.4578221475.

Adding to 30505223 its reverse (32250503), we get a palindrome (62755726).

The spelling of 30505223 in words is "thirty million, five hundred five thousand, two hundred twenty-three".