42505223 has 8 divisors (see below), whose sum is σ = 44873520. Its totient is φ = 40261608.

The previous prime is 42505207. The next prime is 42505231. The reversal of 42505223 is 32250524.

It is not a de Polignac number, because 42505223 - 2⁴ = 42505207 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 (42505823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3761 + ... + 9957.

It is an arithmetic number, because the mean of its divisors is an integer number (5609190).

Almost surely, 2^42505223 is an apocalyptic number.

42505223 is a deficient number, since it is larger than the sum of its proper divisors (2368297).

42505223 is an frugal number, since it uses more digits than its factorization.

42505223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6254 (or 6216 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 42505223 is about 6519.6029787097. The cubic root of 42505223 is about 348.9908974837.

Adding to 42505223 its reverse (32250524), we get a palindrome (74755747).

The spelling of 42505223 in words is "forty-two million, five hundred five thousand, two hundred twenty-three".