123405424 has 20 divisors (see below), whose sum is σ = 242668744. Its totient is φ = 60781248.

The previous prime is 123405413. The next prime is 123405427. The reversal of 123405424 is 424504321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123405427) 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, 56487 + ... + 58630.

Almost surely, 2^123405424 is an apocalyptic number.

It is an amenable number.

123405424 is a deficient number, since it is larger than the sum of its proper divisors (119263320).

123405424 is a wasteful number, since it uses less digits than its factorization.

123405424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115192 (or 115186 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 123405424 is about 11108.7993950742. The cubic root of 123405424 is about 497.8647934320.

Adding to 123405424 its reverse (424504321), we get a palindrome (547909745).

The spelling of 123405424 in words is "one hundred twenty-three million, four hundred five thousand, four hundred twenty-four".