42205439 has 4 divisors (see below), whose sum is σ = 42343224. Its totient is φ = 42067656.

The previous prime is 42205421. The next prime is 42205459. The reversal of 42205439 is 93450224.

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

It is a cyclic number.

It is not a de Polignac number, because 42205439 - 2⁸ = 42205183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42205459) 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, 68432 + ... + 69045.

It is an arithmetic number, because the mean of its divisors is an integer number (10585806).

Almost surely, 2^42205439 is an apocalyptic number.

42205439 is a deficient number, since it is larger than the sum of its proper divisors (137785).

42205439 is a wasteful number, since it uses less digits than its factorization.

42205439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137784.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 42205439 is about 6496.5713264768. The cubic root of 42205439 is about 348.1684980248.

The spelling of 42205439 in words is "forty-two million, two hundred five thousand, four hundred thirty-nine".