It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-123040427 is a prime.
Almost surely, 2123040427 is an apocalyptic number.
123040427 is an equidigital number, since it uses as much as digits as its factorization.
123040427 is an evil number, because the sum of its binary digits is even.
The square root of 123040427 is about 11092.3589465902. The cubic root of 123040427 is about 497.3734627639.
Adding to 123040427 its reverse (724040321), we get a palindrome (847080748).
The spelling of 123040427 in words is "one hundred twenty-three million, forty thousand, four hundred twenty-seven".