138156826 has 16 divisors (see below), whose sum is σ = 212173920. Its totient is φ = 67448880.

The previous prime is 138156817. The next prime is 138156827. The reversal of 138156826 is 628651831.

It is not an unprimeable number, because it can be changed into a prime (138156827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12885 + ... + 21031.

It is an arithmetic number, because the mean of its divisors is an integer number (13260870).

Almost surely, 2^138156826 is an apocalyptic number.

138156826 is a deficient number, since it is larger than the sum of its proper divisors (74017094).

138156826 is a wasteful number, since it uses less digits than its factorization.

138156826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349.

The product of its digits is 69120, while the sum is 40.

The square root of 138156826 is about 11754.0131869928. The cubic root of 138156826 is about 516.9606051789.

The spelling of 138156826 in words is "one hundred thirty-eight million, one hundred fifty-six thousand, eight hundred twenty-six".