1228999775 has 24 divisors (see below), whose sum is σ = 1564118640. Its totient is φ = 957565440.

The previous prime is 1228999699. The next prime is 1228999777. The reversal of 1228999775 is 5779998221.

It is a de Polignac number, because none of the positive numbers 2^k-1228999775 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228999777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180839 + ... + 187511.

It is an arithmetic number, because the mean of its divisors is an integer number (65171610).

Almost surely, 2^1228999775 is an apocalyptic number.

1228999775 is a deficient number, since it is larger than the sum of its proper divisors (335118865).

1228999775 is a wasteful number, since it uses less digits than its factorization.

1228999775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875 (or 6870 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 59.

The square root of 1228999775 is about 35057.0930768653. The cubic root of 1228999775 is about 1071.1507621110.

The spelling of 1228999775 in words is "one billion, two hundred twenty-eight million, nine hundred ninety-nine thousand, seven hundred seventy-five".