42227729 has 2 divisors, whose sum is σ = 42227730. Its totient is φ = 42227728.

The previous prime is 42227723. The next prime is 42227777. The reversal of 42227729 is 92772224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 13337104 = 5375^2 + 3652^2 .

It is a cyclic number.

It is not a de Polignac number, because 42227729 - 2²⁰ = 41179153 is a prime.

It is not a weakly prime, because it can be changed into another prime (42227723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21113864 + 21113865.

It is an arithmetic number, because the mean of its divisors is an integer number (21113865).

Almost surely, 2^42227729 is an apocalyptic number.

It is an amenable number.

42227729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42227729 is an equidigital number, since it uses as much as digits as its factorization.

42227729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 42227729 is about 6498.2866203331. The cubic root of 42227729 is about 348.2297800949.

The spelling of 42227729 in words is "forty-two million, two hundred twenty-seven thousand, seven hundred twenty-nine".