1228019906 has 8 divisors (see below), whose sum is σ = 1905548220. Its totient is φ = 592837168.

The previous prime is 1228019893. The next prime is 1228019909. The reversal of 1228019906 is 6099108221.

It can be written as a sum of positive squares in 2 ways, for example, as 1227871681 + 148225 = 35041^2 + 385^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1228019906.

It is not an unprimeable number, because it can be changed into a prime (1228019909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10586321 + ... + 10586436.

Almost surely, 2^1228019906 is an apocalyptic number.

1228019906 is a deficient number, since it is larger than the sum of its proper divisors (677528314).

1228019906 is a wasteful number, since it uses less digits than its factorization.

1228019906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21172788.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1228019906 is about 35043.1149585764. The cubic root of 1228019906 is about 1070.8660138919.

The spelling of 1228019906 in words is "one billion, two hundred twenty-eight million, nineteen thousand, nine hundred six".