138821326 has 32 divisors (see below), whose sum is σ = 247197888. Its totient is φ = 57231360.

The previous prime is 138821321. The next prime is 138821327. The reversal of 138821326 is 623128831.

It is a happy number.

138821326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 138821291 and 138821300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138821321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40246 + ... + 43558.

It is an arithmetic number, because the mean of its divisors is an integer number (7724934).

Almost surely, 2^138821326 is an apocalyptic number.

138821326 is a deficient number, since it is larger than the sum of its proper divisors (108376562).

138821326 is a wasteful number, since it uses less digits than its factorization.

138821326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436.

The product of its digits is 13824, while the sum is 34.

The square root of 138821326 is about 11782.2462204794. The cubic root of 138821326 is about 517.7880972638.

The spelling of 138821326 in words is "one hundred thirty-eight million, eight hundred twenty-one thousand, three hundred twenty-six".