1138947938 has 16 divisors (see below), whose sum is σ = 1763887104. Its totient is φ = 551204640.

The previous prime is 1138947937. The next prime is 1138947961. The reversal of 1138947938 is 8397498311.

It is a self number, because there is not a number n which added to its sum of digits gives 1138947938.

It is not an unprimeable number, because it can be changed into a prime (1138947937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44270 + ... + 65097.

It is an arithmetic number, because the mean of its divisors is an integer number (110242944).

Almost surely, 2^1138947938 is an apocalyptic number.

1138947938 is a deficient number, since it is larger than the sum of its proper divisors (624939166).

1138947938 is a wasteful number, since it uses less digits than its factorization.

1138947938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109537.

The product of its digits is 1306368, while the sum is 53.

The square root of 1138947938 is about 33748.3027425084. The cubic root of 1138947938 is about 1044.3224740631.

The spelling of 1138947938 in words is "one billion, one hundred thirty-eight million, nine hundred forty-seven thousand, nine hundred thirty-eight".