217340705 has 12 divisors (see below), whose sum is σ = 267026580. Its totient is φ = 169821792.

The previous prime is 217340693. The next prime is 217340707. The reversal of 217340705 is 507043712.

217340705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 162001984 + 55338721 = 12728^2 + 7439^2 .

It is not a de Polignac number, because 217340705 - 2⁴ = 217340689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217340707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2510 + ... + 20999.

It is an arithmetic number, because the mean of its divisors is an integer number (22252215).

Almost surely, 2^217340705 is an apocalyptic number.

It is an amenable number.

217340705 is a deficient number, since it is larger than the sum of its proper divisors (49685875).

217340705 is an equidigital number, since it uses as much as digits as its factorization.

217340705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23600 (or 23557 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 217340705 is about 14742.4796082613. The cubic root of 217340705 is about 601.2388339090.

The spelling of 217340705 in words is "two hundred seventeen million, three hundred forty thousand, seven hundred five".