438651217 has 2 divisors, whose sum is σ = 438651218. Its totient is φ = 438651216.

The previous prime is 438651167. The next prime is 438651223. The reversal of 438651217 is 712156834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438651136 + 81 = 20944^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 438651217 - 2¹⁹ = 438126929 is a prime.

It is a super-3 number, since 3×438651217³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (438658217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219325608 + 219325609.

It is an arithmetic number, because the mean of its divisors is an integer number (219325609).

Almost surely, 2^438651217 is an apocalyptic number.

It is an amenable number.

438651217 is a deficient number, since it is larger than the sum of its proper divisors (1).

438651217 is an equidigital number, since it uses as much as digits as its factorization.

438651217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 438651217 is about 20944.0019337279. The cubic root of 438651217 is about 759.8125212769.

The spelling of 438651217 in words is "four hundred thirty-eight million, six hundred fifty-one thousand, two hundred seventeen".