1229947138 has 12 divisors (see below), whose sum is σ = 2146132422. Its totient is φ = 527120160.

The previous prime is 1229947123. The next prime is 1229947141. The reversal of 1229947138 is 8317499221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1185631489 + 44315649 = 34433^2 + 6657^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 6275143 + ... + 6275338.

Almost surely, 2^1229947138 is an apocalyptic number.

1229947138 is a deficient number, since it is larger than the sum of its proper divisors (916185284).

1229947138 is a wasteful number, since it uses less digits than its factorization.

1229947138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12550497 (or 12550490 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 1229947138 is about 35070.6021904386. The cubic root of 1229947138 is about 1071.4259202762.

The spelling of 1229947138 in words is "one billion, two hundred twenty-nine million, nine hundred forty-seven thousand, one hundred thirty-eight".