427389217 has 2 divisors, whose sum is σ = 427389218. Its totient is φ = 427389216.

The previous prime is 427389139. The next prime is 427389223. The reversal of 427389217 is 712983724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426381201 + 1008016 = 20649^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 427389217 - 2²³ = 419000609 is a prime.

It is not a weakly prime, because it can be changed into another prime (427386217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213694608 + 213694609.

It is an arithmetic number, because the mean of its divisors is an integer number (213694609).

Almost surely, 2^427389217 is an apocalyptic number.

It is an amenable number.

427389217 is a deficient number, since it is larger than the sum of its proper divisors (1).

427389217 is an equidigital number, since it uses as much as digits as its factorization.

427389217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 427389217 is about 20673.3939400380. The cubic root of 427389217 is about 753.2535496253.

The spelling of 427389217 in words is "four hundred twenty-seven million, three hundred eighty-nine thousand, two hundred seventeen".