42406223 has 2 divisors, whose sum is σ = 42406224. Its totient is φ = 42406222.

The previous prime is 42406219. The next prime is 42406229. The reversal of 42406223 is 32260424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42406223 - 2² = 42406219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42406229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203111 + 21203112.

It is an arithmetic number, because the mean of its divisors is an integer number (21203112).

Almost surely, 2^42406223 is an apocalyptic number.

42406223 is a deficient number, since it is larger than the sum of its proper divisors (1).

42406223 is an equidigital number, since it uses as much as digits as its factorization.

42406223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 42406223 is about 6512.0060657220. The cubic root of 42406223 is about 348.7197389844.

Adding to 42406223 its reverse (32260424), we get a palindrome (74666647).

The spelling of 42406223 in words is "forty-two million, four hundred six thousand, two hundred twenty-three".