123540023 has 4 divisors (see below), whose sum is σ = 123562320. Its totient is φ = 123517728.

The previous prime is 123540013. The next prime is 123540031. The reversal of 123540023 is 320045321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 320045321 = 541 ⋅591581.

It is a cyclic number.

It is not a de Polignac number, because 123540023 - 2⁴ = 123540007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123539977 and 123540004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123540013) 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, 4286 + ... + 16292.

It is an arithmetic number, because the mean of its divisors is an integer number (30890580).

Almost surely, 2^123540023 is an apocalyptic number.

123540023 is a deficient number, since it is larger than the sum of its proper divisors (22297).

123540023 is a wasteful number, since it uses less digits than its factorization.

123540023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22296.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 123540023 is about 11114.8559594805. The cubic root of 123540023 is about 498.0457356532.

Adding to 123540023 its reverse (320045321), we get a palindrome (443585344).

The spelling of 123540023 in words is "one hundred twenty-three million, five hundred forty thousand, twenty-three".