1229775138 has 24 divisors (see below), whose sum is σ = 2821249548. Its totient is φ = 385811712.

The previous prime is 1229775119. The next prime is 1229775149. The reversal of 1229775138 is 8315779221.

1229775138 is a `hidden beast` number, since 122 + 9 + 7 + 7 + 513 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1198336689 + 31438449 = 34617^2 + 5607^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1229775093 and 1229775102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2009131 + ... + 2009742.

Almost surely, 2^1229775138 is an apocalyptic number.

1229775138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1229775138 is an abundant number, since it is smaller than the sum of its proper divisors (1591474410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1229775138 is a wasteful number, since it uses less digits than its factorization.

1229775138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018898 (or 4018895 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 1229775138 is about 35068.1499084283. The cubic root of 1229775138 is about 1071.3759739970.

The spelling of 1229775138 in words is "one billion, two hundred twenty-nine million, seven hundred seventy-five thousand, one hundred thirty-eight".