1205212405 has 8 divisors (see below), whose sum is σ = 1447901784. Its totient is φ = 963072000.

The previous prime is 1205212381. The next prime is 1205212417. The reversal of 1205212405 is 5042125021.

It can be written as a sum of positive squares in 4 ways, for example, as 2093809 + 1203118596 = 1447^2 + 34686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1205212405 - 2¹³ = 1205204213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 132396 + ... + 141205.

It is an arithmetic number, because the mean of its divisors is an integer number (180987723).

Almost surely, 2^1205212405 is an apocalyptic number.

It is an amenable number.

1205212405 is a deficient number, since it is larger than the sum of its proper divisors (242689379).

1205212405 is an equidigital number, since it uses as much as digits as its factorization.

1205212405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274487.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1205212405 is about 34716.1692155111. The cubic root of 1205212405 is about 1064.1949598111.

Adding to 1205212405 its reverse (5042125021), we get a palindrome (6247337426).

The spelling of 1205212405 in words is "one billion, two hundred five million, two hundred twelve thousand, four hundred five".