1212405663 has 8 divisors (see below), whose sum is σ = 1847475328. Its totient is φ = 692803224.

The previous prime is 1212405661. The next prime is 1212405673. The reversal of 1212405663 is 3665042121.

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

It is not a de Polignac number, because 1212405663 - 2¹ = 1212405661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212405663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212405661) 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 7 ways as a sum of consecutive naturals, for example, 28866781 + ... + 28866822.

It is an arithmetic number, because the mean of its divisors is an integer number (230934416).

Almost surely, 2^1212405663 is an apocalyptic number.

1212405663 is a deficient number, since it is larger than the sum of its proper divisors (635069665).

1212405663 is an equidigital number, since it uses as much as digits as its factorization.

1212405663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57733613.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1212405663 is about 34819.6160662348. The cubic root of 1212405663 is about 1066.3079620795.

Adding to 1212405663 its reverse (3665042121), we get a palindrome (4877447784).

The spelling of 1212405663 in words is "one billion, two hundred twelve million, four hundred five thousand, six hundred sixty-three".