138167929 has 4 divisors (see below), whose sum is σ = 138191476.
Its totient is φ = 138144384.
The previous prime is 138167819. The next prime is 138167933. The reversal of 138167929 is 929761831.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 929761831 = 7351 ⋅126481.
It can be written as a sum of positive squares in 2 ways, for example, as 6492304 + 131675625 = 2548^2 + 11475^2
It is a cyclic number.
It is not a de Polignac number, because 138167929 - 213 = 138159737 is a prime.
It is a super-3 number, since 3×1381679293 (a number of 25 digits) contains 333 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (138167429) by changing a digit.
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 3 ways as a sum of consecutive naturals, for example, 4897 + ... + 17329.
It is an arithmetic number, because the mean of its divisors is an integer number (34547869).
It is a 5868-hyperperfect number.
Almost surely, 2138167929 is an apocalyptic number.
It is an amenable number.
138167929 is a deficient number, since it is larger than the sum of its proper divisors (23547).
138167929 is a wasteful number, since it uses less digits than its factorization.
138167929 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23546.
The product of its digits is 163296, while the sum is 46.
The square root of 138167929 is about 11754.4854842737.
The cubic root of 138167929 is about 516.9744533542.
The spelling of 138167929 in words is "one hundred thirty-eight million, one hundred sixty-seven thousand, nine hundred twenty-nine".