138925638 has 16 divisors (see below), whose sum is σ = 308723760. Its totient is φ = 46308528.

The previous prime is 138925637. The next prime is 138925651. The reversal of 138925638 is 836529831.

It is a happy number.

138925638 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 2 + 5 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 138925593 and 138925602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138925637) 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 7 ways as a sum of consecutive naturals, for example, 1286295 + ... + 1286402.

It is an arithmetic number, because the mean of its divisors is an integer number (19295235).

Almost surely, 2^138925638 is an apocalyptic number.

138925638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138925638 is an abundant number, since it is smaller than the sum of its proper divisors (169798122).

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

138925638 is a wasteful number, since it uses less digits than its factorization.

138925638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572708 (or 2572702 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 138925638 is about 11786.6720493955. The cubic root of 138925638 is about 517.9177555108.

The spelling of 138925638 in words is "one hundred thirty-eight million, nine hundred twenty-five thousand, six hundred thirty-eight".