3123 has 6 divisors (see below), whose sum is σ = 4524. Its totient is φ = 2076.

The previous prime is 3121. The next prime is 3137. The reversal of 3123 is 3213.

It is a happy number.

3123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3123 - 2¹ = 3121 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: 347 = 3123 / (3 + 1 + 2 + 3).

3123 is a lucky number.

It is a plaindrome in base 11.

It is a nialpdrome in base 5, base 15 and base 16.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3121) 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, 165 + ... + 182.

It is an arithmetic number, because the mean of its divisors is an integer number (754).

3123 is a deficient number, since it is larger than the sum of its proper divisors (1401).

3123 is a wasteful number, since it uses less digits than its factorization.

3123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 350 counting only the distinct ones).

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

The square root of 3123 is about 55.8838080306. The cubic root of 3123 is about 14.6169690732.

Adding to 3123 its reverse (3213), we get a palindrome (6336).

The spelling of 3123 in words is "three thousand, one hundred twenty-three", and thus it is an iban number.