1393216205 has 4 divisors (see below), whose sum is σ = 1671859452. Its totient is φ = 1114572960.

The previous prime is 1393216189. The next prime is 1393216207. The reversal of 1393216205 is 5026123931.

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 1080173956 + 313042249 = 32866^2 + 17693^2 .

It is not a de Polignac number, because 1393216205 - 2⁴ = 1393216189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393216207) 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, 139321616 + ... + 139321625.

It is an arithmetic number, because the mean of its divisors is an integer number (417964863).

Almost surely, 2^1393216205 is an apocalyptic number.

It is an amenable number.

1393216205 is a deficient number, since it is larger than the sum of its proper divisors (278643247).

1393216205 is an equidigital number, since it uses as much as digits as its factorization.

1393216205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278643246.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1393216205 is about 37325.8115116068. The cubic root of 1393216205 is about 1116.8791213297.

The spelling of 1393216205 in words is "one billion, three hundred ninety-three million, two hundred sixteen thousand, two hundred five".