42544405 has 4 divisors (see below), whose sum is σ = 51053292. Its totient is φ = 34035520.

The previous prime is 42544393. The next prime is 42544451. The reversal of 42544405 is 50444524.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14760964 + 27783441 = 3842^2 + 5271^2 .

It is not a de Polignac number, because 42544405 - 2⁵ = 42544373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 4254436 + ... + 4254445.

It is an arithmetic number, because the mean of its divisors is an integer number (12763323).

Almost surely, 2^42544405 is an apocalyptic number.

It is an amenable number.

42544405 is a deficient number, since it is larger than the sum of its proper divisors (8508887).

42544405 is an equidigital number, since it uses as much as digits as its factorization.

42544405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508886.

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 42544405 is about 6522.6072241091. The cubic root of 42544405 is about 349.0980996959.

Adding to 42544405 its reverse (50444524), we get a palindrome (92988929).

The spelling of 42544405 in words is "forty-two million, five hundred forty-four thousand, four hundred five".