138447744 has 32 divisors (see below), whose sum is σ = 367752840. Its totient is φ = 46149120.

The previous prime is 138447721. The next prime is 138447763. The reversal of 138447744 is 447744831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 138447696 and 138447705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179887 + ... + 180654.

Almost surely, 2^138447744 is an apocalyptic number.

It is an amenable number.

138447744 is an abundant number, since it is smaller than the sum of its proper divisors (229305096).

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

138447744 is an equidigital number, since it uses as much as digits as its factorization.

138447744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360558 (or 360546 counting only the distinct ones).

The product of its digits is 301056, while the sum is 42.

The square root of 138447744 is about 11766.3819417865. The cubic root of 138447744 is about 517.3232068966.

The spelling of 138447744 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, seven hundred forty-four".