138938750 has 40 divisors (see below), whose sum is σ = 266877072. Its totient is φ = 54200000.

The previous prime is 138938729. The next prime is 138938753. The reversal of 138938750 is 57839831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138938753) 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 19 ways as a sum of consecutive naturals, for example, 49895 + ... + 52605.

Almost surely, 2^138938750 is an apocalyptic number.

138938750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138938750 is a deficient number, since it is larger than the sum of its proper divisors (127938322).

138938750 is an equidigital number, since it uses as much as digits as its factorization.

138938750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 2759 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 138938750 is about 11787.2282577373. The cubic root of 138938750 is about 517.9340489372.

The spelling of 138938750 in words is "one hundred thirty-eight million, nine hundred thirty-eight thousand, seven hundred fifty".