42442405 has 4 divisors (see below), whose sum is σ = 50930892. Its totient is φ = 33953920.

The previous prime is 42442403. The next prime is 42442427. The reversal of 42442405 is 50424424.

It is a happy number.

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 13905441 + 28536964 = 3729^2 + 5342^2 .

It is not a de Polignac number, because 42442405 - 2¹ = 42442403 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 42442405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42442403) 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, 4244236 + ... + 4244245.

It is an arithmetic number, because the mean of its divisors is an integer number (12732723).

Almost surely, 2^42442405 is an apocalyptic number.

It is an amenable number.

42442405 is a deficient number, since it is larger than the sum of its proper divisors (8488487).

42442405 is an equidigital number, since it uses as much as digits as its factorization.

42442405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488486.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 42442405 is about 6514.7835727674. The cubic root of 42442405 is about 348.8188894543.

Adding to 42442405 its reverse (50424424), we get a palindrome (92866829).

The spelling of 42442405 in words is "forty-two million, four hundred forty-two thousand, four hundred five".