427729217 has 2 divisors, whose sum is σ = 427729218. Its totient is φ = 427729216.

The previous prime is 427729199. The next prime is 427729223. The reversal of 427729217 is 712927724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385101376 + 42627841 = 19624^2 + 6529^2 .

It is a cyclic number.

It is not a de Polignac number, because 427729217 - 2⁶ = 427729153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (427729297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213864608 + 213864609.

It is an arithmetic number, because the mean of its divisors is an integer number (213864609).

Almost surely, 2^427729217 is an apocalyptic number.

It is an amenable number.

427729217 is a deficient number, since it is larger than the sum of its proper divisors (1).

427729217 is an equidigital number, since it uses as much as digits as its factorization.

427729217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 427729217 is about 20681.6154349703. The cubic root of 427729217 is about 753.4532413922.

The spelling of 427729217 in words is "four hundred twenty-seven million, seven hundred twenty-nine thousand, two hundred seventeen".