42420205 has 4 divisors (see below), whose sum is σ = 50904252. Its totient is φ = 33936160.

The previous prime is 42420181. The next prime is 42420223. The reversal of 42420205 is 50202424.

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 10361961 + 32058244 = 3219^2 + 5662^2 .

It is not a de Polignac number, because 42420205 - 2⁹ = 42419693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242016 + ... + 4242025.

It is an arithmetic number, because the mean of its divisors is an integer number (12726063).

Almost surely, 2^42420205 is an apocalyptic number.

It is an amenable number.

42420205 is a deficient number, since it is larger than the sum of its proper divisors (8484047).

42420205 is an equidigital number, since it uses as much as digits as its factorization.

42420205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8484046.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42420205 is about 6513.0795327556. The cubic root of 42420205 is about 348.7580609040.

Adding to 42420205 its reverse (50202424), we get a palindrome (92622629).

The spelling of 42420205 in words is "forty-two million, four hundred twenty thousand, two hundred five".