623123 has 4 divisors (see below), whose sum is σ = 644640. Its totient is φ = 601608.

The previous prime is 623107. The next prime is 623171. The reversal of 623123 is 321326.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321326 = 2 ⋅160663.

It is a cyclic number.

It is not a de Polignac number, because 623123 - 2⁴ = 623107 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10715 + ... + 10772.

It is an arithmetic number, because the mean of its divisors is an integer number (161160).

2⁶²³¹²³ is an apocalyptic number.

623123 is a deficient number, since it is larger than the sum of its proper divisors (21517).

623123 is a wasteful number, since it uses less digits than its factorization.

623123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21516.

The product of its digits is 216, while the sum is 17.

The square root of 623123 is about 789.3814033786. The cubic root of 623123 is about 85.4131215133.

Adding to 623123 its reverse (321326), we get a palindrome (944449).

The spelling of 623123 in words is "six hundred twenty-three thousand, one hundred twenty-three".