42235405 has 4 divisors (see below), whose sum is σ = 50682492. Its totient is φ = 33788320.

The previous prime is 42235399. The next prime is 42235409. The reversal of 42235405 is 50453224.

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 18088009 + 24147396 = 4253^2 + 4914^2 .

It is not a de Polignac number, because 42235405 - 2⁵ = 42235373 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 42235405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42235409) 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, 4223536 + ... + 4223545.

It is an arithmetic number, because the mean of its divisors is an integer number (12670623).

Almost surely, 2^42235405 is an apocalyptic number.

It is an amenable number.

42235405 is a deficient number, since it is larger than the sum of its proper divisors (8447087).

42235405 is an equidigital number, since it uses as much as digits as its factorization.

42235405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8447086.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 42235405 is about 6498.8772107188. The cubic root of 42235405 is about 348.2508787892.

Adding to 42235405 its reverse (50453224), we get a palindrome (92688629).

The spelling of 42235405 in words is "forty-two million, two hundred thirty-five thousand, four hundred five".