1228163805 has 24 divisors (see below), whose sum is σ = 2322347040. Its totient is φ = 595473120.

The previous prime is 1228163773. The next prime is 1228163809. The reversal of 1228163805 is 5083618221.

It is a happy number.

1228163805 is a `hidden beast` number, since 12 + 2 + 8 + 1 + 638 + 0 + 5 = 666.

It is not a de Polignac number, because 1228163805 - 2⁵ = 1228163773 is a prime.

It is a super-3 number, since 3×1228163805³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228163805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228163809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1240075 + ... + 1241064.

It is an arithmetic number, because the mean of its divisors is an integer number (96764460).

Almost surely, 2^1228163805 is an apocalyptic number.

1228163805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228163805 is a deficient number, since it is larger than the sum of its proper divisors (1094183235).

1228163805 is a wasteful number, since it uses less digits than its factorization.

1228163805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481161 (or 2481158 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1228163805 is about 35045.1680692218. The cubic root of 1228163805 is about 1070.9078401764.

It can be divided in two parts, 122816 and 3805, that added together give a palindrome (126621).

The spelling of 1228163805 in words is "one billion, two hundred twenty-eight million, one hundred sixty-three thousand, eight hundred five".