138791768 has 16 divisors (see below), whose sum is σ = 261894480. Its totient is φ = 68953248.

The previous prime is 138791759. The next prime is 138791797. The reversal of 138791768 is 867197831.

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, 53996 + ... + 56507.

It is an arithmetic number, because the mean of its divisors is an integer number (16368405).

Almost surely, 2^138791768 is an apocalyptic number.

It is an amenable number.

138791768 is a deficient number, since it is larger than the sum of its proper divisors (123102712).

138791768 is a wasteful number, since it uses less digits than its factorization.

138791768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110666 (or 110662 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 138791768 is about 11780.9918088419. The cubic root of 138791768 is about 517.7513453050.

The spelling of 138791768 in words is "one hundred thirty-eight million, seven hundred ninety-one thousand, seven hundred sixty-eight".