138638380 has 12 divisors (see below), whose sum is σ = 291140640. Its totient is φ = 55455344.

The previous prime is 138638359. The next prime is 138638387. The reversal of 138638380 is 83836831.

It is not an unprimeable number, because it can be changed into a prime (138638387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3465940 + ... + 3465979.

It is an arithmetic number, because the mean of its divisors is an integer number (24261720).

Almost surely, 2^138638380 is an apocalyptic number.

138638380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138638380 is an abundant number, since it is smaller than the sum of its proper divisors (152502260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138638380 is a wasteful number, since it uses less digits than its factorization.

138638380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6931928 (or 6931926 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 138638380 is about 11774.4800309823. The cubic root of 138638380 is about 517.5605411991.

The spelling of 138638380 in words is "one hundred thirty-eight million, six hundred thirty-eight thousand, three hundred eighty".