30123 has 6 divisors (see below), whose sum is σ = 43524. Its totient is φ = 20076.

The previous prime is 30119. The next prime is 30133. The reversal of 30123 is 32103.

It is a happy number.

It is not a de Polignac number, because 30123 - 2² = 30119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 3347 = 30123 / (3 + 0 + 1 + 2 + 3).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (30103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1665 + ... + 1682.

It is an arithmetic number, because the mean of its divisors is an integer number (7254).

2³⁰¹²³ is an apocalyptic number.

30123 is a deficient number, since it is larger than the sum of its proper divisors (13401).

30123 is a wasteful number, since it uses less digits than its factorization.

30123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353 (or 3350 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 30123 is about 173.5597879694. The cubic root of 30123 is about 31.1147326661.

Adding to 30123 its reverse (32103), we get a palindrome (62226).

It can be divided in two parts, 301 and 23, that added together give a square (324 = 18²).

The spelling of 30123 in words is "thirty thousand, one hundred twenty-three".