138943444 has 12 divisors (see below), whose sum is σ = 245303604. Its totient is φ = 68856704.

The previous prime is 138943433. The next prime is 138943451. The reversal of 138943444 is 444349831.

It can be written as a sum of positive squares in 2 ways, for example, as 37699600 + 101243844 = 6140^2 + 10062^2 .

It is a super-2 number, since 2×138943444² = 38610561261162272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138943397 and 138943406.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 153247 + ... + 154150.

It is an arithmetic number, because the mean of its divisors is an integer number (20441967).

Almost surely, 2^138943444 is an apocalyptic number.

It is an amenable number.

138943444 is a deficient number, since it is larger than the sum of its proper divisors (106360160).

138943444 is a wasteful number, since it uses less digits than its factorization.

138943444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307514 (or 307512 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 138943444 is about 11787.4273698717. The cubic root of 138943444 is about 517.9398816154.

The spelling of 138943444 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, four hundred forty-four".