1212263805 has 16 divisors (see below), whose sum is σ = 1959620544. Its totient is φ = 639874560.

The previous prime is 1212263777. The next prime is 1212263807. The reversal of 1212263805 is 5083622121.

It is not a de Polignac number, because 1212263805 - 2⁹ = 1212263293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212263807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415131 + ... + 418040.

It is an arithmetic number, because the mean of its divisors is an integer number (122476284).

Almost surely, 2^1212263805 is an apocalyptic number.

1212263805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212263805 is a deficient number, since it is larger than the sum of its proper divisors (747356739).

1212263805 is an equidigital number, since it uses as much as digits as its factorization.

1212263805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833276.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1212263805 is about 34817.5789652296. The cubic root of 1212263805 is about 1066.2663725303.

Adding to 1212263805 its reverse (5083622121), we get a palindrome (6295885926).

The spelling of 1212263805 in words is "one billion, two hundred twelve million, two hundred sixty-three thousand, eight hundred five".