138491 has 8 divisors (see below), whose sum is σ = 150480. Its totient is φ = 127008.
The previous prime is 138469. The next prime is 138493. The reversal of 138491 is 194831.
138491 is nontrivially palindromic in base 14.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 138491 - 26 = 138427 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 138491.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138491.
It is not an unprimeable number, because it can be changed into a prime (138493) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605 + ... + 801.
It is an arithmetic number, because the mean of its divisors is an integer number (18810).
2138491 is an apocalyptic number.
138491 is a deficient number, since it is larger than the sum of its proper divisors (11989).
138491 is a wasteful number, since it uses less digits than its factorization.
138491 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 253.
The product of its digits is 864, while the sum is 26.
The square root of 138491 is about 372.1437894148. The cubic root of 138491 is about 51.7377078011.
The spelling of 138491 in words is "one hundred thirty-eight thousand, four hundred ninety-one".
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