1138940668 has 12 divisors (see below), whose sum is σ = 2005082352. Its totient is φ = 566060000.

The previous prime is 1138940659. The next prime is 1138940689. The reversal of 1138940668 is 8660498311.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851833 + ... + 853168.

It is an arithmetic number, because the mean of its divisors is an integer number (167090196).

Almost surely, 2^1138940668 is an apocalyptic number.

It is an amenable number.

1138940668 is a deficient number, since it is larger than the sum of its proper divisors (866141684).

1138940668 is a wasteful number, since it uses less digits than its factorization.

1138940668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705172 (or 1705170 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1138940668 is about 33748.1950332162. The cubic root of 1138940668 is about 1044.3202520591.

The spelling of 1138940668 in words is "one billion, one hundred thirty-eight million, nine hundred forty thousand, six hundred sixty-eight".