138026444 has 24 divisors (see below), whose sum is σ = 244937280. Its totient is φ = 68051664.

The previous prime is 138026419. The next prime is 138026461. The reversal of 138026444 is 444620831.

It is a self number, because there is not a number n which added to its sum of digits gives 138026444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89867 + ... + 91389.

It is an arithmetic number, because the mean of its divisors is an integer number (10205720).

Almost surely, 2^138026444 is an apocalyptic number.

It is an amenable number.

138026444 is a deficient number, since it is larger than the sum of its proper divisors (106910836).

138026444 is a wasteful number, since it uses less digits than its factorization.

138026444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829 (or 1827 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 138026444 is about 11748.4656019414. The cubic root of 138026444 is about 516.7979311758.

The spelling of 138026444 in words is "one hundred thirty-eight million, twenty-six thousand, four hundred forty-four".