138689344 has 14 divisors (see below), whose sum is σ = 275211794. Its totient is φ = 69344640.

The previous prime is 138689329. The next prime is 138689371. The reversal of 138689344 is 443986831.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 65415744 = 8560^2 + 8088^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138689294 and 138689303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083447 + ... + 1083574.

Almost surely, 2^138689344 is an apocalyptic number.

It is an amenable number.

138689344 is a deficient number, since it is larger than the sum of its proper divisors (136522450).

138689344 is an equidigital number, since it uses as much as digits as its factorization.

138689344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167033 (or 2167023 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 138689344 is about 11776.6440041295. The cubic root of 138689344 is about 517.6239525094.

The spelling of 138689344 in words is "one hundred thirty-eight million, six hundred eighty-nine thousand, three hundred forty-four".