138421750 has 16 divisors (see below), whose sum is σ = 259125984. Its totient is φ = 55368600.

The previous prime is 138421747. The next prime is 138421753. The reversal of 138421750 is 57124831.

It is an interprime number because it is at equal distance from previous prime (138421747) and next prime (138421753).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138421753) 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 7 ways as a sum of consecutive naturals, for example, 276594 + ... + 277093.

It is an arithmetic number, because the mean of its divisors is an integer number (16195374).

Almost surely, 2^138421750 is an apocalyptic number.

138421750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138421750 is a deficient number, since it is larger than the sum of its proper divisors (120704234).

138421750 is an equidigital number, since it uses as much as digits as its factorization.

138421750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553704 (or 553694 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 138421750 is about 11765.2773022993. The cubic root of 138421750 is about 517.2908285163.

The spelling of 138421750 in words is "one hundred thirty-eight million, four hundred twenty-one thousand, seven hundred fifty".