42240423 has 4 divisors (see below), whose sum is σ = 56320568. Its totient is φ = 28160280.

The previous prime is 42240413. The next prime is 42240433. The reversal of 42240423 is 32404224.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42240413) and next prime (42240433).

It is not a de Polignac number, because 42240423 - 2⁵ = 42240391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42240423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7040068 + ... + 7040073.

It is an arithmetic number, because the mean of its divisors is an integer number (14080142).

Almost surely, 2^42240423 is an apocalyptic number.

42240423 is a deficient number, since it is larger than the sum of its proper divisors (14080145).

42240423 is a wasteful number, since it uses less digits than its factorization.

42240423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14080144.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 42240423 is about 6499.2632659402. The cubic root of 42240423 is about 348.2646701704.

Adding to 42240423 its reverse (32404224), we get a palindrome (74644647).

The spelling of 42240423 in words is "forty-two million, two hundred forty thousand, four hundred twenty-three".