1205908217 has 4 divisors (see below), whose sum is σ = 1211220816. Its totient is φ = 1200595620.

The previous prime is 1205908213. The next prime is 1205908229. The reversal of 1205908217 is 7128095021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7128095021 = 4129 ⋅1726349.

It is a cyclic number.

It is not a de Polignac number, because 1205908217 - 2² = 1205908213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205908213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2655959 + ... + 2656412.

It is an arithmetic number, because the mean of its divisors is an integer number (302805204).

Almost surely, 2^1205908217 is an apocalyptic number.

It is an amenable number.

1205908217 is a deficient number, since it is larger than the sum of its proper divisors (5312599).

1205908217 is an equidigital number, since it uses as much as digits as its factorization.

1205908217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312598.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 1205908217 is about 34726.1892092985. The cubic root of 1205908217 is about 1064.3997196150.

The spelling of 1205908217 in words is "one billion, two hundred five million, nine hundred eight thousand, two hundred seventeen".