42404040423 has 24 divisors (see below), whose sum is σ = 64892625408. Its totient is φ = 26590298112.

The previous prime is 42404040397. The next prime is 42404040431. The reversal of 42404040423 is 32404040424.

It is a happy number.

It is not a de Polignac number, because 42404040423 - 2⁶ = 42404040359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42404040433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171111 + ... + 337767.

It is an arithmetic number, because the mean of its divisors is an integer number (2703859392).

Almost surely, 2^42404040423 is an apocalyptic number.

42404040423 is a deficient number, since it is larger than the sum of its proper divisors (22488584985).

42404040423 is a wasteful number, since it uses less digits than its factorization.

42404040423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168343 (or 168340 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 42404040423 its reverse (32404040424), we get a palindrome (74808080847).

Subtracting from 42404040423 its reverse (32404040424), we obtain a palindrome (9999999999).

The spelling of 42404040423 in words is "forty-two billion, four hundred four million, forty thousand, four hundred twenty-three".