1238665388 has 12 divisors (see below), whose sum is σ = 2237589312. Its totient is φ = 599354160.

The previous prime is 1238665367. The next prime is 1238665403. The reversal of 1238665388 is 8835668321.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4994495 + ... + 4994742.

It is an arithmetic number, because the mean of its divisors is an integer number (186465776).

Almost surely, 2^1238665388 is an apocalyptic number.

It is an amenable number.

1238665388 is a deficient number, since it is larger than the sum of its proper divisors (998923924).

1238665388 is a wasteful number, since it uses less digits than its factorization.

1238665388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9989272 (or 9989270 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The square root of 1238665388 is about 35194.6784045543. The cubic root of 1238665388 is about 1073.9514962947.

The spelling of 1238665388 in words is "one billion, two hundred thirty-eight million, six hundred sixty-five thousand, three hundred eighty-eight".