42390223 has 2 divisors, whose sum is σ = 42390224. Its totient is φ = 42390222.

The previous prime is 42390211. The next prime is 42390239. The reversal of 42390223 is 32209324.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42390223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42390203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21195111 + 21195112.

It is an arithmetic number, because the mean of its divisors is an integer number (21195112).

Almost surely, 2^42390223 is an apocalyptic number.

42390223 is a deficient number, since it is larger than the sum of its proper divisors (1).

42390223 is an equidigital number, since it uses as much as digits as its factorization.

42390223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 42390223 is about 6510.7774497367. Note that the first 3 decimals coincide. The cubic root of 42390223 is about 348.6758757862.

Adding to 42390223 its reverse (32209324), we get a palindrome (74599547).

The spelling of 42390223 in words is "forty-two million, three hundred ninety thousand, two hundred twenty-three".