138530826 has 48 divisors (see below), whose sum is σ = 343796544. Its totient is φ = 39491712.

The previous prime is 138530809. The next prime is 138530827. The reversal of 138530826 is 628035831.

It is not an unprimeable number, because it can be changed into a prime (138530827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73026 + ... + 74898.

It is an arithmetic number, because the mean of its divisors is an integer number (7162428).

Almost surely, 2^138530826 is an apocalyptic number.

138530826 is an abundant number, since it is smaller than the sum of its proper divisors (205265718).

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

138530826 is a wasteful number, since it uses less digits than its factorization.

138530826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 138530826 is about 11769.9118943176. The cubic root of 138530826 is about 517.4266674777.

The spelling of 138530826 in words is "one hundred thirty-eight million, five hundred thirty thousand, eight hundred twenty-six".