138868388 has 12 divisors (see below), whose sum is σ = 253585920. Its totient is φ = 66415272.

The previous prime is 138868381. The next prime is 138868399. The reversal of 138868388 is 883868831.

It is not an unprimeable number, because it can be changed into a prime (138868381) by changing a digit.

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, 754628 + ... + 754811.

It is an arithmetic number, because the mean of its divisors is an integer number (21132160).

Almost surely, 2^138868388 is an apocalyptic number.

It is an amenable number.

138868388 is a deficient number, since it is larger than the sum of its proper divisors (114717532).

138868388 is a wasteful number, since it uses less digits than its factorization.

138868388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509466 (or 1509464 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 53.

The square root of 138868388 is about 11784.2432086240. The cubic root of 138868388 is about 517.8466026605.

The spelling of 138868388 in words is "one hundred thirty-eight million, eight hundred sixty-eight thousand, three hundred eighty-eight".