349807217 has 4 divisors (see below), whose sum is σ = 350205156. Its totient is φ = 349409280.

The previous prime is 349807189. The next prime is 349807219. The reversal of 349807217 is 712708943.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92236816 + 257570401 = 9604^2 + 16049^2 .

It is a cyclic number.

It is not a de Polignac number, because 349807217 - 2⁶ = 349807153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349807219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197648 + ... + 199409.

It is an arithmetic number, because the mean of its divisors is an integer number (87551289).

Almost surely, 2^349807217 is an apocalyptic number.

It is an amenable number.

349807217 is a deficient number, since it is larger than the sum of its proper divisors (397939).

349807217 is an equidigital number, since it uses as much as digits as its factorization.

349807217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397938.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 349807217 is about 18703.1338817857. The cubic root of 349807217 is about 704.6004590245.

The spelling of 349807217 in words is "three hundred forty-nine million, eight hundred seven thousand, two hundred seventeen".