42205243 has 4 divisors (see below), whose sum is σ = 42835240. Its totient is φ = 41575248.

The previous prime is 42205217. The next prime is 42205279. The reversal of 42205243 is 34250224.

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 42205243 - 2¹⁷ = 42074171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42265243) 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, 314898 + ... + 315031.

It is an arithmetic number, because the mean of its divisors is an integer number (10708810).

Almost surely, 2^42205243 is an apocalyptic number.

42205243 is a deficient number, since it is larger than the sum of its proper divisors (629997).

42205243 is an equidigital number, since it uses as much as digits as its factorization.

42205243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629996.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42205243 is about 6496.5562415791. The cubic root of 42205243 is about 348.1679590648.

Adding to 42205243 its reverse (34250224), we get a palindrome (76455467).

The spelling of 42205243 in words is "forty-two million, two hundred five thousand, two hundred forty-three".