138231306 has 16 divisors (see below), whose sum is σ = 307180800. Its totient is φ = 46077084.
The previous prime is 138231239. The next prime is 138231319. The reversal of 138231306 is 603132831.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a self number, because there is not a number n which added to its sum of digits gives 138231306.
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, 1279866 + ... + 1279973.
It is an arithmetic number, because the mean of its divisors is an integer number (19198800).
Almost surely, 2138231306 is an apocalyptic number.
138231306 is an abundant number, since it is smaller than the sum of its proper divisors (168949494).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
138231306 is a wasteful number, since it uses less digits than its factorization.
138231306 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2559850 (or 2559844 counting only the distinct ones).
The product of its (nonzero) digits is 2592, while the sum is 27.
The square root of 138231306 is about 11757.1810396880. The cubic root of 138231306 is about 517.0534858809.
It can be divided in two parts, 13823 and 1306, that added together give a square (15129 = 1232).
The spelling of 138231306 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, three hundred six".
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