138683826 has 20 divisors (see below), whose sum is σ = 310754862. Its totient is φ = 46227888.

The previous prime is 138683821. The next prime is 138683843. The reversal of 138683826 is 628386831.

138683826 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 134583201 + 4100625 = 11601^2 + 2025^2 .

It is not an unprimeable number, because it can be changed into a prime (138683821) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 427875 + ... + 428198.

Almost surely, 2^138683826 is an apocalyptic number.

138683826 is an abundant number, since it is smaller than the sum of its proper divisors (172071036).

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

138683826 is an equidigital number, since it uses as much as digits as its factorization.

138683826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856087 (or 856078 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138683826 is about 11776.4097245298. The cubic root of 138683826 is about 517.6170875579.

The spelling of 138683826 in words is "one hundred thirty-eight million, six hundred eighty-three thousand, eight hundred twenty-six".